Malicious PDF — malware analysis report

Static analysis result for SHA-256 c296ed80752af0aa…

MALICIOUS

PDF

80.8 KB Created: 2021-03-11 17:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6420f89022f90dfe9ddc3f41b0c8bc4e SHA-1: 9b273df39c418767d5148bc0a6b31ac25960520d SHA-256: c296ed80752af0aa18d613cb410153ce8f7b99066dc66d438a79325dbb622d9c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, indicative of a link farm or SEO spamming technique. The primary URL, https://vilenefex.ru/123?utm_term=platform+high+heels+blue+and+gold, suggests a lure related to product sales. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=platform+high+heels+blue+and+gold
    • https://cdn-cms.f-static.net/uploads/4467003/normal_6020aa9fc2d05.pdf
    • https://cdn-cms.f-static.net/uploads/4457843/normal_600c506f5c54b.pdf
    • https://zizeximafebofiz.weebly.com/uploads/1/3/4/3/134369397/muzobuxem.pdf
    • https://lirujisigibat.weebly.com/uploads/1/3/0/8/130874608/2748112.pdf
    • https://vuzaruluweketex.weebly.com/uploads/1/3/4/4/134478477/94fc77b9dd59a4.pdf
    • https://cdn-cms.f-static.net/uploads/4447087/normal_6014f308bc439.pdf
    • http://sawemawe.mywebcommunity.org/bruce_lee_fighting_method_vol_1.pdf
    • https://cdn-cms.f-static.net/uploads/4420589/normal_60185d77766cb.pdf
    • http://xedeporib.medianewsonline.com/where_to_watch_the_secret_movie.pdf
    • https://nixetamusizag.weebly.com/uploads/1/3/0/7/130740210/3332e016c19df.pdf
    • http://sotipidikukunow.getenjoyment.net/what_is_the_effect_of_recording_a_warranty_deed.pdf
    • https://jokikisiva.weebly.com/uploads/1/3/0/8/130873994/4921554.pdf
    • http://mosebuzixat.mywebcommunity.org/mesitudasizodadivajibezu.pdf
    • http://sutovuresas.mygamesonline.org/figenugerira.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/livivuvuwugeb/c_mvc_interview_questions_and_answers_for_6_years_experience.pdf
    • https://s3.amazonaws.com/bisegilupuf/92611611395.pdf
    • https://s3.amazonaws.com/tupofelasujewas/french_dictionary_audio_pronunciation_free.pdf
    • https://s3.amazonaws.com/sezewu/50835881205.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f12d.bin
a28d5b5185454f67974f76d75b23305ae59f285a08b491a444aa53a6f9bcda7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 5344 bytes
font_01_sfnt_off00010325.bin
4968fd69b728ae5b1b94ad1c19c8f68713353138bbc5e199364c5abd23bc7a15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10325 10308 bytes
font_02_sfnt_off00012668.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 4324 bytes

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