Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c4082b9df6a3369…

MALICIOUS

PDF

73.2 KB Created: 2021-03-27 12:03:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c75c2f9f71b5687394a459c346754ee SHA-1: 5489e84abbe37221a6a86fb9d0a2105426d02e5a SHA-256: 0c4082b9df6a3369215a0a4bb66962eb5fc82d95461590dd72776640a1e9863c
186 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 ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/strik?utm_term=caracteristicas+de+el+modo+de+produccion+socialista PDF link annotation
    • http://bavewemelemare.iblogger.org/21093482084.pdfIn PDF document text
    • http://sport-stavki.fun/how_to_crochet_a_baby_jacket_set47wbo.pdfIn PDF document text
    • http://dwatches.site/a2_smd_diode_datasheet3xlga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5ff33aa41c51a.pdfIn PDF document text
    • https://cdn.sqhk.co/belexewuwif/jjhjgFi/mesufu.pdfIn PDF document text
    • http://lenudes.com/1920093457owp5a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489977/normal_5fe0eae3ae8fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_60343aec7f37c.pdfIn PDF document text
    • https://cdn.sqhk.co/xaveredero/hgct4Mb/xbox_series_s_for_sale_uk.pdfIn PDF document text
    • http://bezprovodov.guru/jebidexuvitopekubedutovid7smo2.pdfIn PDF document text
    • https://cdn.sqhk.co/tavedikovo/iehfjbv/nasa_news_meteor_hitting_earth.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f0a4a2c-edca-427d-88e9-3617711be449/canon_imageclass_d320_s35_cartridge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9a65428-0dd0-4d95-984b-90cba857d017/big_green_egg_table_nest_amazon.pdfIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_36d594487eec45d4b13813fdcf98a8cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/57bf9e5d-18a4-4a97-8989-813236f85cd0/26929837192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e063a9f-c46f-4d74-80a0-714feb0612ae/zuvikafowuvesulalugita.pdfIn PDF document text
    • https://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_c617d3253e814667896235013c232e9b.pdf?index=trueIn PDF document text
    • http://nugoxasozuvazet.rf.gd/does_oxidation_occur_only_at_the_anode.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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 5124 bytes
SHA-256: 68d2562da5f2c7296c6557b1397d4af775531a860c6762146aafdb0790fc0a76
font_01_sfnt_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 11748 bytes
SHA-256: d6f4175e193676bdf0238758c409af23d9ca0be3497c41ec0327e23528e02d50

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