Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7cc84635cf4119…

MALICIOUS

PDF

75.8 KB Created: 2021-03-11 22:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 437d58526012cd0da5a3fd1ae552c21f SHA-1: d1221a3ff277380e115a41c65c2b3963dd515be4 SHA-256: 4d7cc84635cf4119e2069f62d9a6a1e4075891544c9dd22cce4f4341a03e7048
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, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable hosting and potentially malicious domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to PDF generation and keywords that might be used for SEO poisoning to attract victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/wix?keyword=numerical+expression+worksheets+6th+grade+pdf PDF link annotation
    • http://mibikazut.mypressonline.com/ttd_telugu_calendar_2020_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_6043ebf219c13.pdfIn PDF document text
    • https://cdn.sqhk.co/wadusazilox/7CqMVSC/elite_nail_spa_maple_grove.pdfIn PDF document text
    • http://idealica-it.website/thank_you_very_much_for_your_prompt_email_replytcdrq.pdfIn PDF document text
    • http://dilawiputonu.mypressonline.com/75684408788.pdfIn PDF document text
    • http://0fruit.space/ferigafugoxiganikotzr07d.pdfIn PDF document text
    • http://larts.digital/betiwekenepomenekilpw6so.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387417/normal_600fab709071e.pdfIn PDF document text
    • https://cdn.sqhk.co/bujasugawo/ezjepjf/posumejelitofazisene.pdfIn PDF document text
    • http://replyua.site/wazasefomixowip4cqew.pdfIn PDF document text
    • http://ighelpcenter.xyz/easy_way_to_learn_cnc_programmingexyin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463543/normal_601daedd913db.pdfIn PDF document text
    • http://rekatilugo.iblogger.org/nouns_adjectives_verbs_worksheet.pdfIn PDF document text
    • http://katipef.medianewsonline.com/agricola_all_creatures_rules.pdfIn PDF document text
    • http://dorightpress.com/28616536956bpxtv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nitadotir.epizy.com/t-fal_fr8000_deep_fryer_reviews.pdfIn PDF document text
    • http://mobifov.rf.gd/romaposifigi.pdfIn PDF document text
    • http://mebofubanu.rf.gd/65321679946.pdfIn PDF document text
    • http://gerutinikokowa.epizy.com/increase_confidence.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_off0000e66e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66E 5916 bytes
SHA-256: d39e07ed5e31b6c1d3a176aa825added72a06a6cf1009f6b84be7bcf82aac3c3
font_01_sfnt_off0000fa87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA87 10992 bytes
SHA-256: f732f1d854f7ac0fb988de9c82b85bf9b82f0dcab71498861db0e838aaddce5b

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