Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f6443e1636ebd4…

MALICIOUS

PDF

68.9 KB Created: 2020-12-03 15:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f33794a665fd2006a74246646f8345a4 SHA-1: 7a85419e418e994cca947ef81113e4238eb47899 SHA-256: 43f6443e1636ebd47f6d40fc998cf6a54bb407167b6265ab774cfef4f6cf4932
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one identified as a malicious redirector and another part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to direct users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/strik?utm_term=once+i+was+7+years+old+lyrics+meaning
    • https://tejivabir.weebly.com/uploads/1/3/4/7/134714352/suwafarazu-kaxamalokumodex.pdf
    • https://domuvajedoxu.weebly.com/uploads/1/3/4/8/134847007/3321055.pdf
    • https://sasozubavurak.weebly.com/uploads/1/3/4/8/134886198/8733275.pdf
    • https://mutabezikubi.weebly.com/uploads/1/3/4/7/134739743/vugojidowe.pdf
    • https://static.s123-cdn-static.com/uploads/4485591/normal_5fc7ea3223abe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bededuxotulapil/merge_intervals_problem.pdf
    • https://s3.amazonaws.com/vokeri/kodi_on_apple_tv.pdf
    • https://s3.amazonaws.com/tejuvonixag/10792811267.pdf
    • https://static1.squarespace.com/static/5fc141a05687f52b6b83892d/t/5fc8ebe58fd43c0a66ed63cd/1607003110118/85963934909.pdf
    • https://s3.amazonaws.com/bepukuba/89964103066.pdf
    • https://static1.squarespace.com/static/5fc191a61452f90b7fea0e1e/t/5fc4f84e3570fb44d19ef1f8/1606744146150/decade_of_decadence_vinyl.pdf
    • https://static1.squarespace.com/static/5fc0c9c111f6a41984851340/t/5fc3e124f81c9a2a0c193cb0/1606672677215/serujuvawu.pdf
    • https://static1.squarespace.com/static/5fc0ec955687f52b6b8145c1/t/5fc15a05cb3e0f57718207ef/1606507013850/nigerian_meat_pie_recipe_sisi_yemmie.pdf
    • https://static1.squarespace.com/static/5fc0ea1fa8793968640865e0/t/5fc4132b61e25426e1b77326/1606685483546/i_am_that_girl_book_free.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfda.bin
17944e8b79e55fca2f79d88a05626a57398ec15e7cf2dfaf49827f461f53d8cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDA 5560 bytes
font_01_sfnt_off0000e2c8.bin
364d910d047f5ef8169038b027a1145bd4a644884752e37f06ad3b785094a57f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C8 10616 bytes

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