Malicious PDF — malware analysis report

Static analysis result for SHA-256 859b0abc50552442…

MALICIOUS

PDF

79.8 KB Created: 2021-03-17 11:49:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: cbc92579305a4cdfd18fe524006f4071 SHA-1: ea12c02bcd0d9c78e3a7793677c7a9c09525085d SHA-256: 859b0abc50552442ca8248bca132721ab99ed40f1f38c764e49d446bce2165e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a phishing or malware distribution attempt.

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://bologen.ru/strik?utm_term=the+rational+male+positive+masculinity+by+rollo+tomassi PDF link annotation
    • http://todayshop.website/angry_granny_run_game_download9g33d.pdfIn PDF document text
    • http://bibivire.mygamesonline.org/walmart_albert_pike_hot_springs_arkansas_phone_number.pdfIn PDF document text
    • http://sunakijabe.sportsontheweb.net/punctuation_worksheets_with_answers.pdfIn PDF document text
    • http://winoraama.fun/trader_joes_frozen_turkey_burgers_cooking_instructions82rxx.pdfIn PDF document text
    • http://rujakagixawimir.22web.org/basha_telugu_movie_from_utorrent.pdfIn PDF document text
    • http://zagozogenef.sportsontheweb.net/comparative_analysis_essay_example.pdfIn PDF document text
    • http://goproonly.com/practically_cheating_statistics_handbook_3rd_editionkrpwk.pdfIn PDF document text
    • http://alkim.xyz/66672013545bxlki.pdfIn PDF document text
    • http://dwatches.site/dimafozosomofubexivitewgcyru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414336/normal_5fe4d1102d3e0.pdfIn PDF document text
    • http://vugezaselefobop.iblogger.org/odia_gapa.pdfIn PDF document text
    • http://papotupeti.iblogger.org/18002317550.pdfIn PDF document text
    • http://betmoy57.com/what_did_congressional_reconstruction_look_like8e1b0.pdfIn PDF document text
    • http://big-ita.space/winkbed_mattress_near_me8ecfw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448980/normal_5fc7c563b183f.pdfIn PDF document text
    • http://fewemika.66ghz.com/nowetasif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pagikojezokatu.rf.gd/gewamimobomus.pdfIn PDF document text
    • http://kasisexa.rf.gd/what_is_a_community_sociology.pdfIn PDF document text
    • http://ledojiwibobuva.rf.gd/2605437969.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_off0000f8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C1 5424 bytes
SHA-256: f7645715254e72b1f57729421eb8e40c18a8cb7503d67d8ed648ed95e445fac3
font_01_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 11168 bytes
SHA-256: 1e2f925f80546441dfab32b9d85b32772502ee5aff1d1a60c03ea30f0ba9dc01

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