Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c628c9ee9f97d7…

MALICIOUS

PDF

149.9 KB Created: 2021-02-12 13:08:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d5b0d86ea10704a124129a4efac8ec41 SHA-1: 9d2ec5b1b9603de3d89cdf205b0719b7d9a889ce SHA-256: 08c628c9ee9f97d72903a39d3332dab2d88cec814eb39efddffd0c722b39923e
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a tactic of creating numerous links on disposable hosting to obscure the true malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://leonvi.ru/wix?keyword=megasquirt+tuning+guide PDF link annotation
    • http://sellamorem.com/4822212481h72b3.pdfIn PDF document text
    • http://shoop-fo.ru/3526951498533jff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_5fea0697d06e5.pdfIn PDF document text
    • http://nubokokepiw.iblogger.org/xebatugomoxegeso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491436/normal_5ffccfcc1271b.pdfIn PDF document text
    • https://livadekawa.weebly.com/uploads/1/3/5/3/135317457/sumube.pdfIn PDF document text
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/5603302.pdfIn PDF document text
    • https://tunozuranoba.weebly.com/uploads/1/3/5/3/135316660/ad5af68d05.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/xudomodikevobibedu.pdfIn PDF document text
    • https://samituvejasuw.weebly.com/uploads/1/3/1/4/131406365/4838474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404112/normal_5fd27df2d9a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385635/normal_600ef436d1b35.pdfIn PDF document text
    • https://naxomusiji.weebly.com/uploads/1/3/1/6/131606859/raseroluja.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/3597045.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xunonevikonog.rf.gd/demon_hunter_diablo_3_leveling_guide.pdfIn PDF document text
    • http://kekokid.epizy.com/38785581413.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_off00020296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20296 4864 bytes
SHA-256: 41b979cb63593f47b51b35c12d6299828ab770c7c84fdd9ab7c8875b58653935
font_01_sfnt_off00021321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21321 12076 bytes
SHA-256: 1fe17bfabf892fa5254737ca08ece1500e52c3658f6f6d9231f9302572785274
font_02_sfnt_off00023bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23BCA 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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