Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf52e5b01e04b2d…

MALICIOUS

PDF

86.5 KB Created: 2021-03-21 11:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b676138115e9cb360622ca4ca0d2c7c0 SHA-1: 2bb46e044c3af861b14cc2f0b211bf27547a1712 SHA-256: ccf52e5b01e04b2d57ecb5417e4a8862b50cbfbe56c18d4f69ef5880508d7bbe
176 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely phishing or malware distribution. While no scripts were extracted, the PDF structure and numerous external URLs suggest an attempt to redirect users to malicious sites or host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://zajinet.ru/wix?keyword=xbox+360+controller+guide+button+windows+10
    • https://static.s123-cdn-static.com/uploads/4369629/normal_5fe1834749140.pdf
    • https://cdn-cms.f-static.net/uploads/4475853/normal_602da1088cbec.pdf
    • https://cdn-cms.f-static.net/uploads/4465907/normal_5fdb1a0e3f9d3.pdf
    • http://relibafogat.sportsontheweb.net/didukezaludubogiramexofo.pdf
    • http://sosyaltakipcipanelin.com/90032502090tspjq.pdf
    • http://bupimobim.sportsontheweb.net/82551490380.pdf
    • http://afracheat2.xyz/dowodotagidobebexal7goa.pdf
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5ff849ae67b7d.pdf
    • http://pupapumibe.sportsontheweb.net/klb_biology_book_1_download.pdf
    • http://raponikidosal.getenjoyment.net/63833107291.pdf
    • https://static.s123-cdn-static.com/uploads/4489411/normal_5ff3211c91a24.pdf
    • https://cdn-cms.f-static.net/uploads/4373511/normal_6050fca75a276.pdf
    • https://cdn-cms.f-static.net/uploads/4484610/normal_6029e2b8d0948.pdf
    • https://cdn-cms.f-static.net/uploads/4413735/normal_603f0db6b064d.pdf
    • http://merishwheelrecords.com/mimabuvajemekaxfgt5.pdf
    • https://cdn-cms.f-static.net/uploads/4493916/normal_6027ba5d61fc7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_1263941109ab4f7d8b122b939b5c0425.pdf?index=true
    • https://1ce8651a-bfbb-4b9a-b1bf-24b3b574775a.filesusr.com/ugd/ac72e0_05556b8a5bb74004b2293741b7283b7e.pdf?index=true
    • http://pudolajuji.atwebpages.com/37578173577.pdf
    • http://fumibilulad.atwebpages.com/critical_path_method_in_construction.pdf
    • http://jabodegodonirad.atwebpages.com/what_are_the_two_functions_of_the_fallopian_tubes.pdf
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_4b7087ccc169467b8ee453c0bf80ce4c.pdf?index=true
    • http://xutenujute.myartsonline.com/61273404070.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_off000110fb.bin
5dea6093ac72ce9dc4282f85bcd022ae091cb60d8ea8904ea88c6f5455c62fad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110FB 5684 bytes
font_01_sfnt_off0001247a.bin
a381d2418f3df6454de0e3143fb75736e8b269e557aed16fd54f2d310b778446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1247A 11688 bytes

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