Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fcabc85583920c…

MALICIOUS

PDF

81.8 KB Created: 2020-11-14 22:08:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4fdfe57fd3b0530e2f1c2189c9d7bbb SHA-1: 5e3abbb940ea628b27fd166279c6b50c62768bd4 SHA-256: 16fcabc85583920c524a81bdcc887f9853a1e2af8393f289e6cf967511dd4503
214 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic firing indicating it links to known malicious redirector infrastructure. Another critical heuristic identifies it as a PDF link farm, suggesting a phishing or malware distribution attempt. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious links points towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ggtraff.ru/123?utm_term=advanced+web+shield+avast
    • https://cdn-cms.f-static.net/uploads/4366048/normal_5f87080f4334d.pdf
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5f96071eda85f.pdf
    • https://cdn-cms.f-static.net/uploads/4369647/normal_5f8ce50621aee.pdf
    • https://mivosubewo.weebly.com/uploads/1/3/1/4/131407796/borawixis-kegeluruxakij-jabofu.pdf
    • https://ziripovopibew.weebly.com/uploads/1/3/0/8/130874468/vataboj_vadefawusimor_refogesanawuve.pdf
    • https://cdn-cms.f-static.net/uploads/4407729/normal_5f94b23df140a.pdf
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5f926935c3eb6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/degerutisig/st._clair_county_assessor_parcel_search.pdf
    • https://uploads.strikinglycdn.com/files/66fba950-c629-494e-ab8a-29d9bf6ce463/wesley_lau_biography.pdf
    • https://uploads.strikinglycdn.com/files/c2428609-af5a-4151-8892-f24aa16982bd/19782672777.pdf
    • https://uploads.strikinglycdn.com/files/1d3fcedf-8f5a-4f9e-9541-6390915ff7e1/calories_dominos_pizza.pdf
    • https://uploads.strikinglycdn.com/files/0428d717-444f-4843-aa3e-5c8136061817/xurudolevivu.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/joshua_heller_pcs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec56.bin
f28eb321d14b031dd48a7e0037dbb325293ab499b408ff587885577588e13833		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC56 3992 bytes
font_01_sfnt_off0000fa8b.bin
a0ed6d9fe86fb70724b9b882db58ae5ee1272fb21bfd6ff910e61b17ded34f3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8B 5212 bytes
font_02_sfnt_off00010c58.bin
01b002ed9e1804939da3de06ff96b6c4e52f7fd81e22f506fbd810a8461684d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 15152 bytes

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