Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a6f7c2cff7172d0…

MALICIOUS

PDF

84.8 KB Created: 2021-01-14 03:39:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4005b1ffe1086ca7030e62db1576efe4 SHA-1: cd629433e370794da9fcd8dc04d65e6d35c18224 SHA-256: 1a6f7c2cff7172d085f7e1f9a52c375c23d407543c8c2eca9e71f1a58bf627a5
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure (ggtraff.ru). The document body is heavily obfuscated, but the presence of numerous links suggests an attempt to direct users to external, potentially harmful sites. No scripts were extracted, but the overall structure and link analysis indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ggtraff.ru/123?utm_term=successful+in+spanish+sentence In PDF document text
    • https://static.s123-cdn-static.com/uploads/4420034/normal_5ffd2bd5f0dfd.pdfIn PDF document text
    • https://site-1202138.mozfiles.com/files/1202138/docker_mac_os.pdfIn PDF document text
    • https://pesowisigafu.weebly.com/uploads/1/3/0/7/130739627/9673072.pdfIn PDF document text
    • https://site-1168276.mozfiles.com/files/1168276/7841555412.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/dRhgdij/buduneguvikujame.pdfIn PDF document text
    • https://site-1166725.mozfiles.com/files/1166725/monster_truck_driving_games_online.pdfIn PDF document text
    • https://site-1174422.mozfiles.com/files/1174422/kubomub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466161/normal_5fb509f53e25f.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/840880.pdfIn PDF document text
    • https://site-1168031.mozfiles.com/files/1168031/24214023319.pdfIn PDF document text
    • https://site-1174882.mozfiles.com/files/1174882/selesu.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/mesotodimus/vatican_city_visit_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EB 11704 bytes
SHA-256: 3a6b396816ed2fc44c05deacbecca879f3569945b6a7ec7bda7ed8ea1431d82c
font_01_sfnt_off00010889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10889 5108 bytes
SHA-256: 94f0ecd1d772c2b2f8bbf6f6f399a4552a13b85b0a1323559e4b83186eabf459
font_02_sfnt_off000119ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 14676 bytes
SHA-256: eca7163897a8f3c083b74a0920216371a9b06898ce6400f2413488c6a18be3a1

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