Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6e87190d0acb98f…

MALICIOUS

PDF

68.3 KB Created: 2020-12-20 03:03:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40b2b7f0f107c393cdea58cb66acbda1 SHA-1: 12dca92b45f01b99c9cc9cfc5d62266d4911a468 SHA-256: c6e87190d0acb98fea406c74c2fe7348ad0454e1ab0684eb761989e9dac20aec
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which point to link farm infrastructure and redirectors, suggesting an attempt to lead users to malicious sites. The document body, though heavily obfuscated, appears to be a lure disguised as a worksheet answer key.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=acids+bases+and+ph+worksheet+answer+key
    • https://cdn-cms.f-static.net/uploads/4369917/normal_5f8930e07cca1.pdf
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/kelipibaguzetine.pdf
    • https://loboweron.weebly.com/uploads/1/3/2/6/132681880/semumob.pdf
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5fc8b43d31874.pdf
    • https://cdn-cms.f-static.net/uploads/4366639/normal_5fdb35d9a419e.pdf
    • https://cdn-cms.f-static.net/uploads/4419630/normal_5fada68f0ebd9.pdf
    • https://lifexusubanipi.weebly.com/uploads/1/3/4/3/134377686/wanevejenevotov_sojuxarebovuf_fosalapex_sumodolode.pdf
    • https://salexutoxor.weebly.com/uploads/1/3/4/7/134761189/xinifa.pdf
    • https://guxolufesa.weebly.com/uploads/1/3/4/4/134468064/733642.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fde7c6a297e1070131a54d5/t/5fde962e42c0045a33ff200c/1608422958490/zugumirosepotagub.pdf
    • https://static1.squarespace.com/static/5fc2953ad26ff1194f7e808d/t/5fc3e5d81972c46e3c15e451/1606673880716/5426785187.pdf
    • https://static1.squarespace.com/static/5fc5922424b06a7eb31f4865/t/5fcb4da61df7590d80dd6ce9/1607159206679/bubble_gum_simulator_pet_shop.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_off0000ce40.bin
869e669c46bad6db7cc787041f928d5f4fd1b5abddcfa56035adbef4a4fc2ee4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE40 5516 bytes
font_01_sfnt_off0000e10e.bin
1c16bf2d6a23c63c883c3d32ef39d0231cbf7f72a0e5ea6175da01bcc408c36a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE10E 10500 bytes

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