Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f8a1d57630c8d3…

MALICIOUS

PDF

82.7 KB Created: 2021-03-26 06:38:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 4a535b02011f7feec0a3ef9ac286a40e SHA-1: 9fbfeb2bff6fcbe21b1d6cad2d9214e8676601c9 SHA-256: 74f8a1d57630c8d31f04080f0f2b6d1effbd0d680eb415175da76d04f75bf854
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/wix?keyword=brainpop+plate+tectonics+quiz+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4487906/normal_5ff492da13441.pdfIn PDF document text
    • http://ig-verifiedsbadge.com/kefaxelipubbln.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489981/normal_5fd64ebcd080e.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/ijigshb/commercial_bank_of_ethiopia_addis_ababa_swift_code.pdfIn PDF document text
    • https://cdn.sqhk.co/sirojenu/hdwhcjj/stickman_dismounting_2._1.pdfIn PDF document text
    • http://com-copyrighit.com/alexander_the_great_death_aged5rvw.pdfIn PDF document text
    • http://mylic.ru/breville_toaster_oven_sizek34fh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483587/normal_604914d8bc5ef.pdfIn PDF document text
    • https://cdn.sqhk.co/nomitusibop/j6knIku/93585346650.pdfIn PDF document text
    • http://vigastlens.xyz/is_the_nuwave_brio_a_good_air_fryera7vlt.pdfIn PDF document text
    • https://cdn.sqhk.co/satovepato/yW5tihg/ny_giants_injury_report.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/Gfig2hf/84319751499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496148/normal_6001c6a9a75c5.pdfIn PDF document text
    • https://cdn.sqhk.co/tavaxikanabu/hhgm2gd/football_heads_champions_league_2019_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/dUChi1j/93409975192.pdfIn PDF document text
    • http://filfex.ru/sunbeam_5891_bread_maker_manualdauhk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417030/normal_5fd15c2c0c378.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ade735a-7d0c-44da-93b2-5712c737ada7/49732407844.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b238dac1-e12f-46e4-b840-f0e062eaa194/rajan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d41f2e0-46ee-48dc-a848-5594f0d6e48c/85245403536.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab891024-fa62-4a0b-89a7-45582a4f5a40/96736012667.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_off000103c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C4 5408 bytes
SHA-256: 2a90d247b0e0a97c6e2079290e1de54ec6129f24a0a193c6f53e3d812137f3d4
font_01_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 10948 bytes
SHA-256: 0a1e874a2257503fd1e247f677d9217eaed6c1912c031875baa588dfec5377da

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