Malicious PDF — malware analysis report

Static analysis result for SHA-256 9debd0f1372ac493…

MALICIOUS

PDF

73.6 KB Created: 2021-02-21 13:58:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7d520b25f76dd8a5eaafdca8848c6c97 SHA-1: 5fa88f3d56a6ce0ceddd0202b0135e880742a2a5 SHA-256: 9debd0f1372ac493550e163285a63ea2cd931a16ae091eddecf165c057b795e1
126 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to economic principles, likely a pretext for 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://jottigo.ru/123?utm_term=cuales+son+los+principios+de+la+economia+solidaria+en+colombia PDF link annotation
    • https://sapigufebo.weebly.com/uploads/1/3/4/5/134592603/7058169.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470232/normal_5fc7dd6147577.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492586/normal_602e3ac5ed7bf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380876/normal_5fcc9f193be67.pdfIn PDF document text
    • http://zdorovienashevse.xyz/bao_thanh_thien_1993_fulllp9v5.pdfIn PDF document text
    • http://luxshop21.site/kimuzagawozezurizodefigivwnvj.pdfIn PDF document text
    • http://gradstroy.su/50697372784tii3v.pdfIn PDF document text
    • http://afracheat6.xyz/74171978801y4znq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_60317383221c3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407552/normal_5feb1b1cc2a99.pdfIn PDF document text
    • https://zetoruribafepa.weebly.com/uploads/1/3/1/4/131452904/jokolavojepimigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_602766b0315ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_5fe81fdd074e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gufesabil.rf.gd/pallet_stretch_wrapping_machine_exp-_308_manual.pdfIn PDF document text
    • http://gizenelik.rf.gd/bundesagentur_fr_arbeit_form.pdfIn PDF document text
    • http://pisepivowunasi.rf.gd/url_video_er_extension.pdfIn PDF document text
    • http://dedapudebofeje.rf.gd/misfit_of_demon_king_academy_season_2_manga.pdfIn PDF document text
    • http://tizesabukabel.rf.gd/larixorero.pdfIn PDF document text
    • http://povuputuk.epizy.com/kufodutapejebadujixogen.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_off0000e13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13D 5264 bytes
SHA-256: 8369e25c2f7ded3434b5d7a7c1b2bf23433764faa580b120c93ecd2e23656bca
font_01_sfnt_off0000f301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 11084 bytes
SHA-256: fb764907d53d0280812e262dcb7873c0ffc13e4822d4058f6c5d63f1e03cd0a0

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