Malicious PDF — malware analysis report

Static analysis result for SHA-256 c08457b85eefdbfe…

MALICIOUS

PDF

69.5 KB Created: 2020-11-24 12:01:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7c7a32d886bb9df95b212af081a158d6 SHA-1: e78e3282cd158a349d7e85f82f6bee34776b7ab0 SHA-256: c08457b85eefdbfe1a8ffc0550c4832d94779a695662e0e33c8e643d8c105b52
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector and a link farm. The primary malicious URL identified is 'https://traffmen.ru/strik?utm_term=uf+microbiology+syllabus'. While no scripts were extracted, the PDF structure and link farm suggest an attempt to redirect users to malicious content or phishing pages, aligning with spearphishing tactics.

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://traffmen.ru/strik?utm_term=uf+microbiology+syllabus
    • https://lagukekejase.weebly.com/uploads/1/3/0/8/130815031/756be06b2.pdf
    • https://duwelebizan.weebly.com/uploads/1/3/4/7/134701088/tojisupelud.pdf
    • https://xelabuxu.weebly.com/uploads/1/3/4/2/134235382/dusofas_zelitovoruk.pdf
    • https://kupugaxome.weebly.com/uploads/1/3/0/9/130969415/09809c.pdf
    • https://sepubipig.weebly.com/uploads/1/3/4/4/134445985/9062846.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gebukil/53211798493.pdf
    • https://s3.amazonaws.com/bizamesuwepe/27849968152.pdf
    • https://s3.amazonaws.com/tiniruru/gam_bhari_shayari_video_whatsapp.pdf
    • https://s3.amazonaws.com/lakujusitejojet/black_a_line_formal_dresses.pdf
    • https://uploads.strikinglycdn.com/files/609e2f64-e2bb-4488-a486-4b51f9fe1b7b/sotifutuzokopunodumowu.pdf
    • https://s3.amazonaws.com/ronenitevodo/59036001871.pdf
    • https://s3.amazonaws.com/sedimeraxufi/pizulepuse.pdf
    • https://uploads.strikinglycdn.com/files/fb1a8071-74b2-44b0-9dc7-2a43c6723910/jirejaberoro.pdf
    • https://s3.amazonaws.com/nimuwet/vuwajasezebi.pdf
    • https://uploads.strikinglycdn.com/files/32c8de32-67d6-4fec-ab8e-3b183a88654f/tewasetozexasuse.pdf
    • https://uploads.strikinglycdn.com/files/a13dedc1-b8ca-49e4-b400-9ad0dc5fe962/my_years_with_general_motors.pdf
    • https://s3.amazonaws.com/lakujusitejojet/cvc_phrases_worksheets_for_kindergarten.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_off0000d465.bin
85f43523e7aa1496e9c3c1412cc5a33fdee5415fbbeec0d49337c29728fcd87c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD465 5436 bytes
font_01_sfnt_off0000e6db.bin
24c5d4db5e98549992962d1679608338967e667c6ad610f3aae47609dc308059		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DB 10128 bytes

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