Malicious PDF — malware analysis report

Static analysis result for SHA-256 c07fa188558bcb10…

MALICIOUS

PDF

60.7 KB Created: 2021-01-10 00:38:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3b849c9e8e11ac52b9cc3a140cade367 SHA-1: b6ec1a2b05d3542944d56ace62c2ef13b13e0234 SHA-256: c07fa188558bcb10a98141c973403b27aaac79e2499e8603dfaaa05344adbae5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The heuristic analysis revealed it functions as a link farm, embedding numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafftec.ru/aws?utm_term=abaxis+vue+manual PDF link annotation
    • https://site-1176145.mozfiles.com/files/1176145/burrito_bison_launcha_libre_wikipedia.pdfIn PDF document text
    • https://site-1197643.mozfiles.com/files/1197643/zinetixekegeped.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401517/normal_5fc3dd3d81190.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/gchijgg/f1_manager_game_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375531/normal_5f90adb6e5761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386337/normal_5f93b7be518ec.pdfIn PDF document text
    • https://xubidanata.weebly.com/uploads/1/3/4/8/134895671/a434ca976d811d5.pdfIn PDF document text
    • https://xetolakovi.weebly.com/uploads/1/3/4/6/134604046/6497633.pdfIn PDF document text
    • https://kodiridit.weebly.com/uploads/1/3/5/3/135342100/rivukupobabezub_fakijuren_bajitexadib_zezukoxegobo.pdfIn PDF document text
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/a9f8199488d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475379/normal_5fdb5fb3d8194.pdfIn PDF document text
    • https://site-1178449.mozfiles.com/files/1178449/uncertainty_equation_excel.pdfIn PDF document text
    • https://site-1174172.mozfiles.com/files/1174172/kotubikijuvukora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_5fa83ca7cda9a.pdfIn PDF document text
    • https://cdn.sqhk.co/guletema/midjiIt/20469121148.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000b3e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3E7 4992 bytes
SHA-256: 6afb3787d04fd5fb3f68eaa2302d2465bd4983fb29c46020588b5dd3df55b332
font_01_sfnt_off0000c4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DA 9764 bytes
SHA-256: 4954d70a1789dab061e5a490564caf584e62bb1528d5e8ee2fcf71a4af8b842b

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