Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ac09173ce40771…

MALICIOUS

PDF

85.6 KB Created: 2021-01-08 09:38:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 936ebc966ff77a6b004202f8879c3c8b SHA-1: 7e912beeb5503967bc56d8c48a019d29cd135a72 SHA-256: b4ac09173ce407717a46aefb4dbaf3481c9341beba5bdf2ec80250f6d74007a2
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least two identified as malicious redirectors. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to harmful sites. The ML classifier also flagged this PDF with high confidence, supporting its malicious nature. While no scripts were extracted, the primary attack vector appears to be the malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cctraff.ru/aws?utm_term=five+bases+of+power+pdf In PDF document text
    • https://poxobavu.weebly.com/uploads/1/3/1/4/131453713/5494272.pdfIn PDF document text
    • https://zekigoduse.weebly.com/uploads/1/3/4/3/134336209/badenesepaju_guxidizolexu.pdfIn PDF document text
    • https://letitunonagafi.weebly.com/uploads/1/3/4/4/134494227/namari.pdfIn PDF document text
    • https://cdn.sqhk.co/xidatelo/ifhbsgj/vokugabexakidemevewamik.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/gujitodona-gutodeta-dobutakiv-zarenuripokix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b96eb4c5-25e4-43f6-acfe-833e83ba40b4/anoxic_encephalopathy_nursing_care_plan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0b5dac6-149e-48f1-b6d1-0aff374df0ab/jeff_kinney_address.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/20018589639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a23c92-76ba-4e31-8e73-b524a090219c/34631912416.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/zonodowarumokaxobikafefif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b35930-313a-43be-a6d5-dfc2f778265d/nursery_rhymes_songs_free_download_mp4.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_off0001132b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1132B 5248 bytes
SHA-256: fdd9e043a2599d37f8f3dec2ef6a7e9ffdf4767e3ba918a4e000e22d2994a180
font_01_sfnt_off0001252a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 10680 bytes
SHA-256: 5d53bcb3dd6882583eaf561bd31233ce5ac8b80aa1dff22ee8062635fc927bb8

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