Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2c01faaf6a3dbd8…

MALICIOUS

PDF

91.1 KB Created: 2020-11-17 20:06:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d37cfbbe1924cb5a81ff6dd12da7714 SHA-1: 99042affdcb3cac09e727d25a983eeb5cbf74739 SHA-256: a2c01faaf6a3dbd8205af32765bb1bdcf075801e47572802026caf2afcd98348
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files hosted on disposable domains. The presence of a 'Password-protected archive lure' heuristic suggests that the linked content may be a payload requiring a password, often used to bypass gateway scanning. The primary attack pattern involves directing users to potentially malicious or phishing content via a deceptive link structure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://gettraff.ru/strik?utm_term=pentagrama+musical+clave+de+sol+para
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/padixejo.pdf
    • https://cdn-cms.f-static.net/uploads/4408992/normal_5fa5dbe45802b.pdf
    • https://cdn-cms.f-static.net/uploads/4366625/normal_5f873d8a108de.pdf
    • https://fazulozuxili.weebly.com/uploads/1/3/4/6/134625369/pasimisoraj-levazanobivin-dijejumarawora.pdf
    • https://fetatoba.weebly.com/uploads/1/3/4/6/134689412/dejarefolej_rupudip_mixujuvoteka.pdf
    • https://jikolugoxolij.weebly.com/uploads/1/3/1/3/131379047/zaxoxopo-nedaxutofas.pdf
    • https://bilewazivabo.weebly.com/uploads/1/3/2/8/132816117/e4521751.pdf
    • https://kapekutom.weebly.com/uploads/1/3/4/4/134437999/pozoxovope-zawezok.pdf
    • https://giginepa.weebly.com/uploads/1/3/4/3/134389182/wanijupiletafozoxifo.pdf
    • https://dopesijej.weebly.com/uploads/1/3/4/6/134612330/pavaxoduw_dadamokirugewu.pdf
    • https://cdn-cms.f-static.net/uploads/4365646/normal_5f95511702ebd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fowikorejodi/is_so2_a_ionic_or_covalent_compound.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e18.bin
318a36c90aeeb3045dacff91aec4dda0315262790bcd82c4e9f653d5079106e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E18 5456 bytes
font_01_sfnt_off0001209c.bin
2aa7d739a2373f64f1b06a3f173f3a48bbc3b5c2f66360d1b6aebe75dc05b8b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 11996 bytes
font_02_sfnt_off00014807.bin
eb8728b209634f5cf0dcbccd801eedbe8bc3f4553844c4955f61b377f7da468a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14807 16200 bytes

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