Malicious PDF — malware analysis report

Static analysis result for SHA-256 41165426770c6707…

MALICIOUS

PDF

102.3 KB Created: 2021-03-28 21:48:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3099941f0b1a32798d443fad59c15e55 SHA-1: 91efe87ecdf82953faa44a97a0386fba67f37a63 SHA-256: 41165426770c67074ba7eb0739b0a863510923a79bb14442183810311293418d
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of an SEO link farm designed to redirect users to potentially malicious websites. One prominent URL, 'https://zajinet.ru/award?keyword=invention+of+telephone+pdf', is identified as a redirector for a 'free-download phishing' lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links strongly suggest an attempt to trick users into visiting a compromised site, likely to download further malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7728

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 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://zajinet.ru/award?keyword=invention+of+telephone+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373768/normal_6040b519671f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5fdc4579d4e99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413012/normal_60484f0f8ef39.pdfIn PDF document text
    • http://lotupojaxuvutix.mygamesonline.org/50008957601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_601280cb4ed38.pdfIn PDF document text
    • http://suvuxivenorum.mypressonline.com/xugoberufiso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492871/normal_5fece6517261c.pdfIn PDF document text
    • http://koxivesuvif.mypressonline.com/siwuga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://67d298e0-85f4-4ad4-bf36-e1ac857e42fc.filesusr.com/ugd/b6bf5b_637b8652794c4317b0da345fe74d638c.pdf?index=trueIn PDF document text
    • http://lubuzasoxevixan.epizy.com/kepexatedel.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/19558550474.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/gekiluvu.pdfIn PDF document text
    • https://625f08e2-3d8e-45b5-8e8c-b95d001c5c7c.filesusr.com/ugd/d94ae5_00739d947bb542a2b007160704aec7e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xuzed/12661650245.pdfIn PDF document text
    • https://s3.amazonaws.com/gagotaniwipure/32547893788.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/how_much_is_a_stihl_ms290_worth.pdfIn PDF document text
    • https://8d67285a-e3c5-4820-bb1a-bb91ce1079a6.filesusr.com/ugd/d54300_5ca44bbdf0b24eb38b63531a3e02a17c.pdf?index=trueIn PDF document text
    • http://tilukonera.rf.gd/95109844390.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/biddeford_heated_blanket_top_light_blinking.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/canon_580ex_ii_not_firing.pdfIn PDF document text
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_aca49b2996ac4adda2e42999b7f519b2.pdf?index=trueIn PDF document text
    • http://sosewovitifofus.epizy.com/column_addition_and_subtraction_worksheet_year_3.pdfIn PDF document text
    • http://tivakifuzir.atwebpages.com/2513189357.pdfIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_95ca17f3b69a4c789d98667514e6ecb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/galuzirasogetisotid.pdfIn 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_off00016437.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16437 4644 bytes
SHA-256: 683a789a152338750731c31da473913921e236bb6d78bb35babc95428e95f594
font_01_sfnt_off0001740f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1740F 12008 bytes
SHA-256: df968fb673843c25bfeb10f8d91c77cdaa518876ce127a738867776353e10588