Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a2f892bea97618…

MALICIOUS

PDF

71.6 KB Created: 2021-02-16 23:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 17e05e2e2b48666b82965ae69a6abec2 SHA-1: 62591b3a0224d8b267e01bdb57712e162be41a57 SHA-256: 90a2f892bea976186403934a37d12a80f03af91036630b5c3583dfce5e621599
124 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to search terms, suggesting a phishing or scam attempt. The ML classifier strongly indicated maliciousness, and the presence of numerous links on disposable hosting further supports a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=black+and+decker+electric+edger+le750+blade In PDF document text
    • http://meetplafond.xyz/old_blood_stains_on_sheets2cqgo.pdfIn PDF document text
    • https://cdn.sqhk.co/lepagesali/hjgjRGr/senior_world_easyfone.pdfIn PDF document text
    • http://kuroramogesok.iblogger.org/94881391430.pdfIn PDF document text
    • https://cdn.sqhk.co/vukupamita/djfPheq/farming_usa_2_unlimited_money_free_download.pdfIn PDF document text
    • http://select-get.top/aceable_final_exam_answers_texas8g1vf.pdfIn PDF document text
    • http://luchdobro.site/nomebegitifufofewefamubap5vk1.pdfIn PDF document text
    • http://opticsystem.website/legendary_warriors_game2r21f.pdfIn PDF document text
    • http://taxutipepavij.iblogger.org/bikini_bottom_genetics_incomplete_dominance_answer_sheet.pdfIn PDF document text
    • http://jirafka.space/change_data_capture_in_informatica_powercenter3jvqk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://purubonosarule.rf.gd/bupixawuwefotenenuw.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/dodafaga.pdfIn PDF document text
    • http://fuvezijejek.epizy.com/bal_ganesh_movie_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/zerejibixupav/18083701835.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/blank_digital_clock_face_template.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_off0000da7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7B 5528 bytes
SHA-256: 765575eb14510e48f5a784afa16b9905acadaa915b432b07ed7b5ba7413b828d
font_01_sfnt_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 10632 bytes
SHA-256: 6ad8b4303143fd00e0a2edebb30f7c782791be38869f1fe02c27bf1bfb06ad64

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