Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cf7fc440ade1321…

MALICIOUS

PDF

69.4 KB Created: 2021-02-23 05:50:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: f19515c47219dd5a506602c0a089ad88 SHA-1: 5d34740f302f3da69ea448a1d7df93df71c281b7 SHA-256: 0cf7fc440ade1321d99d80fe1e7c328aeff7b942c89a09626a56aad68cae40d1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/strik?utm_term=hunchback+of+notre+dame+name+pronunciation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408987/normal_5fd36cffaf13a.pdfIn PDF document text
    • http://vivezotutune.iblogger.org/99307391832.pdfIn PDF document text
    • http://yesnutural.space/xudekusuwevifenudufogotaoyfq5.pdfIn PDF document text
    • http://cozyplacefor.rest/chanti_movie_audio_songsiblve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_600f5872a65dd.pdfIn PDF document text
    • https://tebobasuzojipol.weebly.com/uploads/1/3/1/4/131407082/463c75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492915/normal_601b386abd5b5.pdfIn PDF document text
    • http://smeshnoykir.space/kerufokq310.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424007/normal_5ff34dbef4142.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_600694389593c.pdfIn PDF document text
    • http://coins24h.com/vosuzubejuxilubga3xj.pdfIn PDF document text
    • http://skameyki.club/scrum_fundamentals_certified_questio2wo6m.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/xapidajovaji/conway_corp_report_power_outage.pdfIn PDF document text
    • http://regipikiwubadov.epizy.com/bibi_bourelly_album.pdfIn PDF document text
    • https://s3.amazonaws.com/pezofut/cerebriform_nevus_sebaceous.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_off0000d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BC 5352 bytes
SHA-256: db649f12a846810306d5658231a39f2b3465f87690a0681a3711da7873e67d7b
font_01_sfnt_off0000e2c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2C3 11388 bytes
SHA-256: 7f9f2cfb4d4c10cf128a389a83f8c4dec10e8e9cd8c44a501a3762c45e0fe284

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