Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc8d0e25c47f6c62…

MALICIOUS

PDF

81.4 KB Created: 2021-05-10 01:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b1b7fc0d070c195db8e974371d8e0e67 SHA-1: 287d6fdc1b996017b94a624957eb9844dbeeb789 SHA-256: bc8d0e25c47f6c62127986cb7d65e70a9ef97766ae58873b309dd0a6d37e103a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://soxebez.ru/strik?utm_term=child+psychology+online+course+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405953/normal_5fe0d632c8f04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_601347eb67639.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/UZghWjd/fifa_soccer_game_2021.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/ldaighg/33001229304.pdfIn PDF document text
    • https://cdn.sqhk.co/xonoguduzob/gggej9K/song_association_game_quiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_60591738808a9.pdfIn PDF document text
    • https://cdn.sqhk.co/rizijuwet/bwFhbqg/horse_jumping_games_to_play_for_free.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/ijghiQf/mexican_word_of_the_day_today.pdfIn PDF document text
    • https://cdn.sqhk.co/gubalugotu/iakrlgc/science_std_8_quiz_10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/fundamentals_of_engineering_exam_study_guide.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_3692980beefb42848e85f036d97be8bd.pdf?index=trueIn PDF document text
    • http://ponekoj.epizy.com/29605075412.pdfIn PDF document text
    • http://povusesa.rf.gd/9095042023.pdfIn PDF document text
    • http://torulebofi.rf.gd/pezikilizunijobom.pdfIn PDF document text
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_ec57d179ce0b434693bb17e1d2701328.pdf?index=trueIn PDF document text
    • https://144c9d4d-401b-437b-b89f-6a5816d7da47.filesusr.com/ugd/cd33f5_2fdb844e3e8f42b78a291faa272f5050.pdf?index=trueIn PDF document text
    • https://ef90beaa-bca2-431e-862c-49c19dd94618.filesusr.com/ugd/06497e_91001a941d494162bf4ea02f30479882.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/twilight_movie_download_in_hindi_720p.pdfIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_fa470a8e3a654f269289697f2610e8a9.pdf?index=trueIn 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_off00010276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10276 5212 bytes
SHA-256: 9263b441ae275c1abbeee059b11661fc91665d049f4477ec1e38734c0d7172e0
font_01_sfnt_off00011434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 10580 bytes
SHA-256: c47d2125cc6b20b23f677a66eaea19b363e6dacc519c947b8159d1418487671e

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