Malicious PDF — malware analysis report

Static analysis result for SHA-256 d091ca746e4ae629…

MALICIOUS

PDF

96.2 KB Created: 2021-04-01 09:25:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e11d0a6fa45b0bb3688f3e44aac87f8d SHA-1: 29444c6cb0ed0b3460e5d425ad295ea279f1f477 SHA-256: d091ca746e4ae629f6c3b5625ef857e06969b11a8316773f31451ae926c9f047
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains, and one specific URL, 'https://jumiwimov.ru/strik?utm_term=listado+de+verbos+para+ni%25C3%25B1os', is directly associated with a heuristic indicating it's part of a link farm designed for SEO manipulation. The document body, though heavily garbled, suggests a lure related to children's educational content, masking the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/strik?utm_term=listado+de+verbos+para+ni%25C3%25B1os PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487431/normal_5fc5bd066c742.pdfIn PDF document text
    • http://trycabinets.xyz/best_english_speaking_app_onlineqbb60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367941/normal_6017be7e0aabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413347/normal_605b48267fdef.pdfIn PDF document text
    • http://hermidkovo.info/rafuwizimerimutijerg3zgt.pdfIn PDF document text
    • http://wefinexof.iblogger.org/english_story_books_learning_english.pdfIn PDF document text
    • http://fofesivolu.iblogger.org/the_resistance_band_workout_book_download.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/laxivirafotelovag75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_60339dc09f741.pdfIn PDF document text
    • http://shimano-stradic.ru/minecraft_pocket_edition_bedwars_map64nr3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478951/normal_5ff2b9682467c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4c8cc264-4606-483b-a6fd-3ab48ba5c15a.filesusr.com/ugd/c626f4_743b20b211ec41aa9cb6feacea610bea.pdf?index=trueIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_68cd4812c8114771a55ad6fa48d5521d.pdf?index=trueIn PDF document text
    • https://b998fa74-583e-446a-a2a7-67f41460fdb2.filesusr.com/ugd/e081f8_1adf9c1886464ea4976c8c63c9ffcb07.pdf?index=trueIn PDF document text
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_071a51464cc74a888ea1fdc7b7d00908.pdf?index=trueIn PDF document text
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_72ea310d41b84ce4b612b60f99a350ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb1bd71-c532-44d3-b6d3-8f719eba2e9c/ar_15_lower_assembly.pdfIn PDF document text
    • https://c827806f-f9bf-4fd3-a4ce-e487c020fa79.filesusr.com/ugd/6fd45c_7245c23049504483bdd2047108acf88f.pdf?index=trueIn PDF document text
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_bb30a486b56446819200cdc9a6cc8835.pdf?index=trueIn PDF document text
    • http://kizosarosuvi.rf.gd/harry_potter_and_the_sorcerers_stone_original_book_cover.pdfIn PDF document text
    • https://298c7861-702e-4dad-8e6b-798164301c36.filesusr.com/ugd/98adb1_2486bf02331d4c8388902fdb1774e1ff.pdf?index=trueIn PDF document text
    • http://vedelobezab.rf.gd/elsword_dimension_witch_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85843dc-697d-4050-9a88-4259d954b654/vopijujaritagib.pdfIn PDF document text
    • https://893c8be9-d140-4a04-8a3e-66bd54b472cd.filesusr.com/ugd/efd7ea_c8b0241ed48e47f1bca291c07e9a33ec.pdf?index=trueIn PDF document text
    • http://xumesata.epizy.com/wovapodatixilinu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA7 6708 bytes
SHA-256: 9c5ca8fccc5c77e3b616d38064f830a529b67204ad21be471be8281710908db0
font_01_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 5276 bytes
SHA-256: 468d6961b51d85dc82a5cd01d27104c6cbe69b1c710e26394831645b453c2dbf
font_02_sfnt_off0001203c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1203C 2576 bytes
SHA-256: 31ab4f4da76915750eef00a7096cf67d0b7c3c932dafb3c971f9fc93e5e65390
font_03_sfnt_off00012ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA7 12580 bytes
SHA-256: de117eb76197ae3a0e46240a4693e63b67d78d19f91c68673f6476d605655718
font_04_sfnt_off000154c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C2 17832 bytes
SHA-256: e771d68b7b626a73a30fbeed2f98a4dbea72fd0c7ffa79097b8dc764daacd989

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