Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5aaf887a0e6f7a…

MALICIOUS

PDF

79.5 KB Created: 2020-12-24 10:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 649ce0d4e5c446322c270acb1289fc26 SHA-1: 73ab39a55af840e8ef0741d2cf0cc2ee646341d5 SHA-256: fa5aaf887a0e6f7a0b8b7256740723d7796cb376f4cca6c6a1008fab5551053e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'bay colony apartments tampa', suggesting a lure for phishing or scamming. The presence of numerous external links points towards an attempt to direct users to malicious sites.

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=bay+colony+apartments+tampa
    • https://cdn.sqhk.co/mivesumor/JgjHVib/bowavugiwigeresolu.pdf
    • https://wovebisaji.weebly.com/uploads/1/3/4/6/134687394/af1a18.pdf
    • https://lonoripub.weebly.com/uploads/1/3/5/3/135319728/1108362.pdf
    • https://xevezuwojuko.weebly.com/uploads/1/3/0/7/130740392/pudexuzagato.pdf
    • https://cdn.sqhk.co/zewuxumaro/ghhjfFM/spirit_sprint_ios.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/64ea0e50-d622-42db-9163-f7482c72004c/91722267705.pdf
    • https://uploads.strikinglycdn.com/files/9335f794-c626-4a7f-b129-b37d22008a2a/dosune.pdf
    • https://uploads.strikinglycdn.com/files/db4bec41-eb57-487a-a5d1-41ad306405ed/68233039294.pdf
    • https://s3.amazonaws.com/xenavuxa/89934374555.pdf
    • https://uploads.strikinglycdn.com/files/6d063267-ae30-44fb-9c0e-1965db858fd2/pojunizi.pdf
    • https://uploads.strikinglycdn.com/files/0e89336d-8d49-4f5d-95b8-80cb4e10ea98/canciones_para_posadas_navidad.pdf
    • https://uploads.strikinglycdn.com/files/90882c59-cb59-40eb-87c8-063ed15e24a9/best_melee_weapon_for_saryn.pdf
    • https://s3.amazonaws.com/nevovumowa/40599087355.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_off0000f8b9.bin
efc7a42ff56c726322b88349d29604146e0ab2cdb4b2853e16d2a67b5a4f6d92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B9 5232 bytes
font_01_sfnt_off00010a78.bin
d5bed7635fd46fbf3f26a2684e8be0debef0f9f1769589f960c5efe675470eb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A78 11328 bytes

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