Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc997532eff4f0ff…

MALICIOUS

PDF

81.8 KB Created: 2021-03-24 21:17:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: cd4dc57a1b57ec03edddc66a2964c16d SHA-1: fe0825831975b9b8dafde36369b9cfdc80ba26aa SHA-256: fc997532eff4f0ff6a937d067e8615a0b86679439eac1c8fb470e3104215ae8d
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful sites. The primary malicious URL identified is https://resalured.ru/strik?utm_term=poulan+chainsaw+manual+pp4218avx, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://resalured.ru/strik?utm_term=poulan+chainsaw+manual+pp4218avx PDF link annotation
    • https://panubawo.weebly.com/uploads/1/3/5/3/135337149/fameminek.pdfIn PDF document text
    • https://dotowukigirer.weebly.com/uploads/1/3/1/1/131163902/tajorelomokejep_lefabowabikezuj_sutivab_xozotad.pdfIn PDF document text
    • http://nitafefuxomod.22web.org/49241989809.pdfIn PDF document text
    • https://wegodirudime.weebly.com/uploads/1/3/2/7/132740829/finesaximazason.pdfIn PDF document text
    • http://kujakaveru.iblogger.org/algebra_2_transforming_linear_functions_worksheet.pdfIn PDF document text
    • http://ridunculus.com/78374045696pmsk9.pdfIn PDF document text
    • https://ramogowerutamu.weebly.com/uploads/1/3/4/4/134488443/59c052ee0.pdfIn PDF document text
    • https://rufilepevaga.weebly.com/uploads/1/3/4/4/134444742/38af4.pdfIn PDF document text
    • http://shoplus.info/summertime_saga_guidesjpfk0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://f770b3d7-c897-40e0-9323-5ad0abd91552.filesusr.com/ugd/1fa6dd_9b34489c38004ba782ffd27715d9a82f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remufuzu/logo_design_competition_guidelines.pdfIn PDF document text
    • https://cb0920a4-0dfc-4587-8161-bd3bf883b043.filesusr.com/ugd/df391a_c50ff2c515de4edf86b81ea6ca3ce33d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gapivegek/metobozatixavefola.pdfIn PDF document text
    • http://towuvoti.epizy.com/malaria_infection.pdfIn PDF document text
    • http://vorenetizufumuj.rf.gd/anonytun_pro_apk_for_android.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_821307d05fb64f1284ff9246278edefd.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_52361b74a2ce43a2bcf84dd3375bc7cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dexodekelaseki/65004401922.pdfIn PDF document text
    • http://mexexumekevuk.rf.gd/auto_frisian_dew_grow_report.pdfIn PDF document text
    • https://c8f0d892-4c73-447a-841b-b6a48a565a7d.filesusr.com/ugd/928a57_e57f613ca26d4426a3a813819a8640c8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pukaridimupo/241306781.pdfIn PDF document text
    • http://fosoxubap.epizy.com/land_of_stories_book_1_audiobook_free.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12B 5448 bytes
SHA-256: ddd34a649f6fca92ddbb22639538b726ad75c94b2429f14b589109e58694a2d5
font_01_sfnt_off000103a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A0 11412 bytes
SHA-256: d8210b6367efb3cb397299a3c22374afda1e96ec1e8f3c02f3206a6d488f9eac
font_02_sfnt_off00012a5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A5A 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71