Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a1b9b0d539a6d14…

MALICIOUS

PDF

69.8 KB Created: 2021-01-13 07:06:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: fea6fba2839709b6c86e5c4a0895e979 SHA-1: e1bda26eea9ee62c2df4e81411ded767531f7465 SHA-256: 6a1b9b0d539a6d14a8fce235605e7b8581d4b3acfdbb2ae5f671f8b8a3e8c895
184 Risk Score

Malware Insights

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

The PDF contains embedded links that are flagged as malicious redirectors, specifically pointing to a URL designed to appear as a movie download. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to movie downloads, reinforcing the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://traffking.ru/wb?keyword=zombie%20killer%20car%20squad%20full%20movie%20download In PDF document text
    • https://vikalixasu.weebly.com/uploads/1/3/4/6/134631782/8762106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490244/normal_5fdf9a8d29d7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470209/normal_5fb48001c054e.pdfIn PDF document text
    • https://misadedami.weebly.com/uploads/1/3/3/9/133997414/lilosafeduguf.pdfIn PDF document text
    • https://site-1167953.mozfiles.com/files/1167953/girl_crush_little_big_town_live.pdfIn PDF document text
    • https://site-1168300.mozfiles.com/files/1168300/fourth_class_maths_olympiad_worksheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470223/normal_5fbbb3c03022b.pdfIn PDF document text
    • https://site-1177275.mozfiles.com/files/1177275/java_for_mac_os_catalina.pdfIn PDF document text
    • https://site-1174422.mozfiles.com/files/1174422/warlords_of_draenor_bonus_objectives.pdfIn PDF document text
    • https://cdn.sqhk.co/worenora/hjhegd1/ikea_kitchen_cabinets_cost_uk.pdfIn PDF document text
    • https://papekukikaduli.weebly.com/uploads/1/3/4/3/134361343/fujipamutavan.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/56544029792.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d36d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36D 5604 bytes
SHA-256: 48fed80deae0f77c5347ba9843c5ee76ee5e3e594a2f3a6370979d9b3cb788b5
font_01_sfnt_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 10508 bytes
SHA-256: d3421e3f7944b5bad574f176f4e73b8e1ac197fcaf4eac1aa982abc2601d0e65

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