Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdcab886e3419ee2…

MALICIOUS

PDF

82.2 KB Created: 2021-02-06 02:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: bc9fd9696c2555d26c6d0a6a74b5130f SHA-1: eab9454aaa54e468fbc800a799a8a374835d5701 SHA-256: bdcab886e3419ee205deb1e48886193d3b153000a977272801d9581f28a24c75
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

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://crophysi.ru/123?utm_term=jacobsen+homelite+320+snowblower+manual PDF link annotation
    • https://cdn.sqhk.co/remimidotomi/gd5Ijg9/23295380842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450632/normal_5fdd94818d2a6.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/jbOibgf/airtel_online_recharge_postpaid_plans.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491969/normal_5ffae7c012420.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/ojcibCt/totupinowijaruku.pdfIn PDF document text
    • http://lnstagram-helping-centre.com/kingdom_come_deliverance_house_of_godcfcez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_5fdc47063195b.pdfIn PDF document text
    • https://kunepupavebi.weebly.com/uploads/1/3/4/0/134095879/delotomabote_fetanotazizedok.pdfIn PDF document text
    • http://hookup157.fun/73704919121ibxy1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369901/normal_5ff7c471aa083.pdfIn PDF document text
    • http://about-central.com/amphorae_and_the_roman_economy_an_introductory_guidep7pjv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefenepisepaje.rf.gd/lipezuferev.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10359 5700 bytes
SHA-256: 30dc2a5161e4306aa77d79e97250d94a89df401aa9314d17b5caa2fb90278cc1
font_01_sfnt_off000116a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116A6 11200 bytes
SHA-256: 85080c764480ec00e39dc16143b77411fde4b7ecfaf55319a3f9146813acddb4

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