Malicious PDF — malware analysis report

Static analysis result for SHA-256 91830e4ac874c106…

MALICIOUS

PDF

70.9 KB Created: 2020-11-24 18:55:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd84f3aceb13c0f5c1ee7ce4c4447cf7 SHA-1: b32a2b9c6236fbdf76b34131eaf2da9270263a47 SHA-256: 91830e4ac874c10651d25a88f94466933514bdaabce02940f594e3d3d64c7ada
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to disposable hosting or redirector infrastructure. The primary link, 'https://ggtraff.ru/aws?utm_term=meningite+bacteriana+sintomas+pdf', is flagged as malicious and likely serves as a lure to a phishing or malware distribution site. The document's structure and link farm behavior suggest it is designed to manipulate search engine results or trick users into visiting malicious sites.

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://ggtraff.ru/aws?utm_term=meningite+bacteriana+sintomas+pdf
    • https://jezitazosebizag.weebly.com/uploads/1/3/4/7/134700096/2796375.pdf
    • https://vodexekuteb.weebly.com/uploads/1/3/0/7/130776001/seponusebuw_fatexabogewugin.pdf
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5fb5b711b8364.pdf
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/torozup.pdf
    • https://lemefinafotujux.weebly.com/uploads/1/3/4/6/134606632/mulad.pdf
    • https://jikidamasot.weebly.com/uploads/1/3/4/8/134874174/nerodegeworibebozu.pdf
    • https://cdn-cms.f-static.net/uploads/4370543/normal_5f886e1cd0424.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/simujix/rixudufiri.pdf
    • https://uploads.strikinglycdn.com/files/2e293ad9-1999-4078-9ec7-756a465c2033/zulavefezarakas.pdf
    • https://s3.amazonaws.com/panokojol/zexepowagiwupig.pdf
    • https://s3.amazonaws.com/tobito/formation_charpentier_menuisier_berthierville.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_off0000caa9.bin
0fb903e7ea256a1c085a3b6ff8cb7ee25087f8d3ea9fadb9c9c23eee596508b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA9 5376 bytes
font_01_sfnt_off0000dcd1.bin
c12b68c5fbc2151c17f86bb912328329240a925d696797898d4960625b654073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD1 10788 bytes
font_02_sfnt_off0001009b.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009B 4324 bytes

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