Malicious PDF — malware analysis report

Static analysis result for SHA-256 81441d105f0aa7b3…

MALICIOUS

PDF

107.4 KB Created: 2021-03-23 05:03:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6a9a42c1600c9c69793bddb9acc46dcb SHA-1: 34272c4d1c49921b8b3a4aed7d28cf42849e837e SHA-256: 81441d105f0aa7b3d4633f5b63f73bbd2e54b1d7575b0014c9c84e03d208e970
204 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm and a redirector. The primary malicious URL, 'https://vilenefex.ru/strik?utm_term=can+police+get+your+snapchats', is presented as a lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=can+police+get+your+snapchats PDF link annotation
    • https://benadegerabo.weebly.com/uploads/1/3/0/8/130874398/9049334.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422368/normal_6033dffca3e00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367294/normal_6059504cb88a4.pdfIn PDF document text
    • http://successinyourlif.website/diritagisupofufakozeza9cxc9.pdfIn PDF document text
    • http://osmosiotzs.fun/1169710393hp75a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454822/normal_6009d869a6f21.pdfIn PDF document text
    • https://megivewoza.weebly.com/uploads/1/3/4/8/134859273/097a76589ff872.pdfIn PDF document text
    • https://nibiromevisike.weebly.com/uploads/1/3/5/2/135299411/232d5df3e02e0.pdfIn PDF document text
    • https://nidukonijeso.weebly.com/uploads/1/3/1/3/131381088/9809493.pdfIn PDF document text
    • http://fridgeservice.ru/41141479601ocs22.pdfIn PDF document text
    • http://j3vnci4.xyz/boy_scout_shop_houston_txdhs26.pdfIn PDF document text
    • https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/523572.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rowubunak/general_knowledge_questions_uk_with_answers.pdfIn PDF document text
    • http://patepuxowibano.rf.gd/brother_ls-1217_walmart.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/58618289911.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/juzuligeruvigimudebenanig.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_98c964597aa34d9c8342b75c37017923.pdf?index=trueIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_ecff22c46fc74a80a9284beac7ff6a0f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fodose/what_is_the_meaning_of_metaphorical_sense.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/alvida_title_song_video.pdfIn PDF document text
    • http://gakelapirafit.epizy.com/tabla_ejercicios_gimnasia_abdominal_hipopresiva.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_off00016339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16339 5204 bytes
SHA-256: afb731536ea4749c30a7acba2581e0db2ecc2618439f0b8d22d7be0b987789ac
font_01_sfnt_off000174e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174E9 12432 bytes
SHA-256: 3e6a815a68e4af9f667ef98c150c19e9318288fec64c8240980a1ebb917e2b46