Malicious PDF — malware analysis report

Static analysis result for SHA-256 a517b5e5776ffcb1…

MALICIOUS

PDF

80.9 KB Created: 2021-03-04 16:37:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 923660b85f35d92628ae095de126ba75 SHA-1: 92d036bd17119f1845c8af2098805868e4a1b772 SHA-256: a517b5e5776ffcb1392cb3dbdc655c93f474fbd42f717545ee02a1c593972c94
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://botokaw.ru/wix?keyword=download+paid+apps+using+apk+downloader PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4404520/normal_6007d632acde7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366341/normal_602611f3940b1.pdfIn PDF document text
    • http://pavuzebeveju.22web.org/894386681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448995/normal_603247402f6ea.pdfIn PDF document text
    • http://fesotisifofil.mygamesonline.org/phonak_brio_3_r-r_price.pdfIn PDF document text
    • http://xulodol.mygamesonline.org/46974288252.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/did_humans_evolve_to_eat_meat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413121/normal_5fe5075656f0c.pdfIn PDF document text
    • http://rogemuso.iblogger.org/dd_5e_planeswalker_background.pdfIn PDF document text
    • http://lowabunuzoxa.getenjoyment.net/complete_list_of_ncaa_banned_substances.pdfIn PDF document text
    • http://jojujikipafoz.iblogger.org/skullcandy_headphones_wont_charge.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480412/normal_5fdffef828cd6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nonogopikizezed.rf.gd/what_is_the_importance_of_features_of_academic_writing.pdfIn PDF document text
    • http://womutefipile.epizy.com/34999829840.pdfIn PDF document text
    • http://letutemoxeluz.onlinewebshop.net/how_to_fix_water_leak_in_samsung_refrigerator.pdfIn PDF document text
    • http://bekogufepe.rf.gd/hvac_sheet_metal_fabrication_houston.pdfIn PDF document text
    • http://lafugigolemetuk.rf.gd/plantronics_voyager_legend_cs_pairing.pdfIn PDF document text
    • http://zuvujivir.rf.gd/the_torah_is_a_sacred_text_of_which_religion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/565a71b6-c093-43c7-a98b-9eea69e71a59/toman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b8143a9-cab0-4cf7-957d-c45542a407ce/is_a_masters_degree_in_information_technology_worth_it_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94ae37f9-c3d4-4551-98c6-9cfde2807206/introduction_to_international_criminal_law.pdfIn PDF document text
    • http://numebazo.rf.gd/audited_balance_sheet_sample.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69f12e3d-561c-45cb-b3b2-80b859ce9e56/moto_g6_plus_case_cover.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001000b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000B 5280 bytes
SHA-256: e5eb572fcb61659fc42557f066c2428013f3fe56cfc5b4ca372f0c4cf26193fd
font_01_sfnt_off0001122e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122E 10476 bytes
SHA-256: 03515b5dc76328791380315edb15784f59f1a10a2ad7c2b9fe4396659cf82137

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