Malicious PDF — malware analysis report

Static analysis result for SHA-256 4aa50aa7bc9baf4b…

MALICIOUS

PDF

87.2 KB Created: 2021-01-06 05:01:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b82bd5e2312c28b0b2ad484d7c7737fd SHA-1: e828ff5a58db427224bd80c44d636ae53473e549 SHA-256: 4aa50aa7bc9baf4bdd1066c23476df5763d24f428229fa51f11264bb5cc8c1e9
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a large number of external PDF links. The ML classifier also assigned a high probability of maliciousness. The embedded links suggest a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://gettraff.ru/aws?utm_term=after+effects+free+transform+layer In PDF document text
    • https://static.s123-cdn-static.com/uploads/4475380/normal_5feec70a06aec.pdfIn PDF document text
    • https://cdn.sqhk.co/razupojoja/D9QzihL/lock_screen_passcode.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/YjiibON/history_of_art_therapy.pdfIn PDF document text
    • https://cdn.sqhk.co/zixajofazadi/VBihhgi/inside_out_institute_assessment.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368477/normal_5f9859bc6e8c2.pdfIn PDF document text
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/kafumop.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/jdgdqig/52399841804.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_5f9c8e9f0379b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405644/normal_5fcda0749042d.pdfIn PDF document text
    • https://cdn.sqhk.co/vebiziwob/9HZheQi/tips_for_finding_imposter_among_us.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/4f08f4f2-62e0-4750-9cd2-9ee89149742c/makita_table_saw_motor_brushes_model_2708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/802bbff7-6184-4f79-abf0-bfeaef46e68b/sepuxakono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d77558a-e0db-46eb-969f-23a78915150f/urban_dictionary_file.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_off0001196b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 5120 bytes
SHA-256: a3b57f59035be2b2c7d94ccb35d61bb6a93e293f33bd71e0897744716e53c308
font_01_sfnt_off00012acf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 10860 bytes
SHA-256: 769c5dd8a755a370995a8a2b0c6157e911291da8848786cc6b96d4c86fbfe0d7

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