Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e1b896fe78ae6a…

MALICIOUS

PDF

77.0 KB Created: 2021-02-22 12:21:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: a1ebaf2cb00803d262d014a86747516f SHA-1: bbec62dc9c78398636e87a4474797d71064c6b65 SHA-256: d1e1b896fe78ae6a0895c264c78caad1ccfcf280734868916394e02fbca6a014
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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/strik?utm_term=how+to+program+clicker+klik2u-p2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450044/normal_5fe6a7b830b00.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446395/normal_5fcd0c812b860.pdfIn PDF document text
    • https://cdn.sqhk.co/woleparos/U3id1ji/just_dance_ps4_controller_needed.pdfIn PDF document text
    • https://cdn.sqhk.co/nusatabi/Zja8egj/bovukabopesumov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fcda0b8e2fa1.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/MgfTOji/stick_war_legacy_2_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/tjjhdK3/armored_car_loses_money_on_285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366313/normal_5fd64aa7c7b3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380230/normal_5ffe27ec733a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_601b9310de8ff.pdfIn PDF document text
    • https://cdn.sqhk.co/xumesapaxoku/giV5UDM/51932660949.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484633/normal_5fe062b4b4c96.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunaropiz/ijBVRrn/pirate_attacks_in_the_caribbean.pdfIn PDF document text
    • https://cdn.sqhk.co/tefulobesa/hkjhdjg/xemevujegarageguposi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://levegukesiwus.rf.gd/37377116386.pdfIn PDF document text
    • http://jewigetujano.epizy.com/jogetabagelolegararop.pdfIn PDF document text
    • http://tinasixubu.epizy.com/34988170904.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/conditional_loan_approval_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/infinity_reporting_group_llc.pdfIn PDF document text
    • http://pujixedigegogup.epizy.com/48369481823.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/44064630805.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/how_do_cars_work_book.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_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 5356 bytes
SHA-256: 75ced10621150490a6dcf3b900bbb08a84f66c932a765716894b6aa6edba41c6
font_01_sfnt_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 11496 bytes
SHA-256: b36c2fbd67f35befb79150014dab7605560a8cedb57c180337bf8f37247c09f5

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