Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac60b979ad1423cf…

MALICIOUS

PDF

88.2 KB Created: 2021-02-22 06:00:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 536c5050e0964c3f06f4cd3c4fb0518f SHA-1: 66f6291e9f226ad99352a1f9af53c9aad4c7886d SHA-256: ac60b979ad1423cff2ad3cf4555737155df1132c61c3a6d088b46ef33c0370a9
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing attempt. It contains numerous external URIs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious or phishing sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'principles of gestalt psychology pdf', likely a lure to disguise the phishing intent.

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://baarspo.ru/123?utm_term=principles+of+gestalt+psychology+pdf PDF link annotation
    • http://wexoxunesixu.iblogger.org/lsat_analytical_reasoning_questions.pdfIn PDF document text
    • https://puwirobazavuwo.weebly.com/uploads/1/3/1/4/131453501/deraref_gigugivul.pdfIn PDF document text
    • http://kugenezajiz.22web.org/lavetisixobokatur.pdfIn PDF document text
    • https://jenazikefu.weebly.com/uploads/1/3/4/0/134017187/915213.pdfIn PDF document text
    • https://xasedomag.weebly.com/uploads/1/3/1/0/131071243/durasozedob.pdfIn PDF document text
    • https://wenabavur.weebly.com/uploads/1/3/1/3/131379405/5b530a6f.pdfIn PDF document text
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/gafipibitokanew.pdfIn PDF document text
    • https://debivozujorebol.weebly.com/uploads/1/3/0/8/130813616/zobuvubovot.pdfIn PDF document text
    • https://rizaxulizogi.weebly.com/uploads/1/3/4/7/134753796/nuzozedemuk_nawalejaret_gesazivim_noviwufus.pdfIn PDF document text
    • http://falifipes.iblogger.org/94877434446.pdfIn PDF document text
    • https://vanewuzopawibo.weebly.com/uploads/1/3/0/8/130814706/6967074.pdfIn PDF document text
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/636791.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lizugerij.epizy.com/air_masses_and_fronts_review_worksheet_answers.pdfIn PDF document text
    • http://zoridod.epizy.com/nijodusoge.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/meboruvol.pdfIn PDF document text
    • http://labopum.rf.gd/frontline_magazine_august_2019.pdfIn PDF document text
    • http://wuzuzifo.epizy.com/aadhar_card_correction_form_post_office.pdfIn PDF document text
    • http://ruwopepifip.rf.gd/cancer_de_pulmon_tratamiento.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_off00011bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BFC 5520 bytes
SHA-256: a15e2947592733514182450629a66518890be49a0613203d6e588570e749fe18
font_01_sfnt_off00012ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC0 11208 bytes
SHA-256: 2b8a025897200100526f36630e5c62fda23e4e8d3334256b23696fae291d62aa

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