Malicious PDF — malware analysis report

Static analysis result for SHA-256 791c2088d2fb7a40…

MALICIOUS

PDF

70.1 KB Created: 2020-11-29 19:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 64e15fc16212fcdec3dec0e74f7c0782 SHA-1: 191e9d5ebec2bcc6fd3eb525b6d703c69f97185f SHA-256: 791c2088d2fb7a40be373604cdd1b3189ace69037a3d021f7773458f3b2a067f
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with one specifically pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is designed as a malicious redirector and a link farm, likely to distribute phishing content or malware. Although no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to direct users to malicious sites, aligning with spearphishing tactics.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffine.ru/123?utm_term=brinkmann+gourmet+electric+smoker+review In PDF document text
    • https://kudaxemukuwofi.weebly.com/uploads/1/3/4/6/134691428/bixuperarewe.pdfIn PDF document text
    • https://gimexewevojux.weebly.com/uploads/1/3/4/5/134523505/vanar_nemorukegotuj.pdfIn PDF document text
    • https://zobigitesi.weebly.com/uploads/1/3/4/6/134691723/fajozukokizetake.pdfIn PDF document text
    • https://vajibudutoneraz.weebly.com/uploads/1/3/4/3/134345344/nupajuzebowoduk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449616/normal_5fa8252685d79.pdfIn PDF document text
    • https://gazitagoro.weebly.com/uploads/1/3/4/0/134016873/b24471208af4e6.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/gelawiweza/saxufakofuxofudaxiget.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/endocardite_infecciosa_guideline.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/meaning_behind_wb_yeats_when_you_are_old.pdfIn PDF document text
    • https://s3.amazonaws.com/figugipopar/tuzavozubinilak.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/angry_mood_off_whatsapp_status.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/mololovoxabelonox.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/ranevu.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/30641363484.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/99238401965.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_off0000d550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD550 5384 bytes
SHA-256: 9f30a84bfd8395a722e9c55de811996a648ec873d4b37066791c5eafa1708a3a
font_01_sfnt_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 10540 bytes
SHA-256: bd37707103a88b5f7e1d28d4d5c3b860e90e7ced3e2ca8bedc071e457348b8ac

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