Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83b952a21cb835f…

MALICIOUS

PDF

68.2 KB Created: 2021-02-02 17:03:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 320b99c78cfda503e335bd98b41d2c67 SHA-1: 21f67a12c206675ead338a8981e6a031f4083e9d SHA-256: f83b952a21cb835f79526f423f3e0159392289eae6accbf390188b2e646473f4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://bologen.ru/aws?utm_term=merging+worksheets+in+tableau PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410418/normal_5fcaa6e31c39b.pdfIn PDF document text
    • http://sq11mini.com/sims_4_crashes_on_startupu4g8z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fef19fb1157e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465538/normal_600c3804eba06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477921/normal_5ff4a6a59b870.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rubijisezet.epizy.com/bendix_air_brake_training_answers.pdfIn PDF document text
    • http://muguvap.epizy.com/vibojoxadefakiwi.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/my_camera_icon_disappeared_android.pdfIn PDF document text
    • http://wifobujaxude.epizy.com/paxojipisexikugi.pdfIn PDF document text
    • http://zesinule.rf.gd/anecdotal_record_form_deped.pdfIn PDF document text
    • http://funurebebepoti.epizy.com/71870073805.pdfIn PDF document text
    • http://vaxutusurinav.epizy.com/alejandro_magno_biografia.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/owners_manual_ford_focus.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/diablo_3_season_15_leveling_guide.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_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 5248 bytes
SHA-256: 8183d67386d702328cacc19cd2b0fd41c3a68e89fac28b1482682376c9c8e04a
font_01_sfnt_off0000e13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13F 10388 bytes
SHA-256: 7afddfd6d5f6667decb6b86e015d31440ed24e3c4d71aa639741396e39aa6215

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