Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf95d02761dce5d7…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 16:58:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e55937d03087797cf613de4d84f23124 SHA-1: 86ec78d36a32f480eb2614e93abf4013ea349232 SHA-256: cf95d02761dce5d7d6019ebbf411f34b09bfec2fb3e558296ad233c9bbd06fc1
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 0.9998

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://maypoin.ru/strik?utm_term=blueprint+medicines+stock+analysis PDF link annotation
    • http://paganel.world/what_are_the_disadvantages_of_coal_powero9rzq.pdfIn PDF document text
    • http://reduslimitalia.website/europa_universalis_4_economy_guidepyy1v.pdfIn PDF document text
    • http://lotsmen.com/master_cleanse_recipe_one_day64yu7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_6052483f91ce3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fd63595b090d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370051/normal_5fcf1b47948c9.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/ejfheie/snakehead_fish_breeding_patterns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_60140ece2c0f0.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/a92jbhg/infection_fatality_rate_by_country.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402932/normal_6050c6ec79d30.pdfIn PDF document text
    • https://cdn.sqhk.co/sobupepokor/iFhiha6/54020278310.pdfIn PDF document text
    • https://cdn.sqhk.co/vigesiji/0Ugd7Ze/47091858577.pdfIn PDF document text
    • http://ndfnasg.xyz/guxujakenujajebibanobrbwls.pdfIn PDF document text
    • http://rezotu.xyz/762399671498onk4.pdfIn PDF document text
    • http://carinsusa.info/vanusikepizojamewefeq6uu8.pdfIn PDF document text
    • https://cdn.sqhk.co/sixepatexup/ajchh3Y/ecology_definition_science_sentence.pdfIn PDF document text
    • http://triple-doska3.club/husqvarna_sewing_machines_melbourne35pv2.pdfIn PDF document text
    • http://detonic-italy.website/dj_sampler_maker_online5dhyh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duvuxosejoxogu.rf.gd/97976924012.pdfIn PDF document text
    • http://kedokonox.rf.gd/formation_charpentier_menuisier_laval.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_off0000f0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C9 5436 bytes
SHA-256: 965edf2ecb2aefb0a06e4b3da127650325f8e779c1ba9191cf1e14c61b2a1f0b
font_01_sfnt_off00010336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10336 11920 bytes
SHA-256: d16b1a8f760f5e60c5bd5b7c9e726a8427185acf004ebb5e00725f80d46aab4c

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