Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3c708ff1c3d2cf…

MALICIOUS

PDF

72.0 KB Created: 2021-02-02 08:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f2c73abdab125e8f7c161c6cc5d52d3a SHA-1: 430d46bb8f29fb10b8c16a304a88ef450d405287 SHA-256: 4a3c708ff1c3d2cf37f588ba9173f71c28c629580d9c41dd03deb733f0a52e4c
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, and the document body, though truncated, suggests a lure related to a 'guide'. The presence of external URIs and link farm characteristics strongly suggests the intent is to redirect users to malicious sites for further exploitation.

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://seumenha.ru/aws?utm_term=bluffer%2527+s+guide+to+the+flight+deck PDF link annotation
    • https://cdn.sqhk.co/ledodatefu/hfiejeI/53667740096.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/ajajhwb/jazz_super_duper_offer_weekly_250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_60182f5b65051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499285/normal_5fe92e08e3832.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377401/normal_600b394f56ecb.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/haBgfhe/download_aplikasi_picsay_pro_photo_editor_apk.pdfIn PDF document text
    • https://natitapa.weebly.com/uploads/1/3/1/3/131379406/vibamixop.pdfIn PDF document text
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/dufarivivisa.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/fmiiqW4/moxewibuzapaxokaxiwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414489/normal_5fe16075a26e5.pdfIn PDF document text
    • https://monokuzofo.weebly.com/uploads/1/3/2/7/132741222/cbdb7346a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pujusojup.epizy.com/blank_unit_circle_template.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/consumer_reports_account_sign_in.pdfIn PDF document text
    • http://bopufadepop.epizy.com/12130670603.pdfIn PDF document text
    • http://kukuvil.epizy.com/catalog_design_template_free.pdfIn PDF document text
    • http://zawagebojirowe.rf.gd/57700780143.pdfIn PDF document text
    • http://bajivuselome.epizy.com/ributonajuxuno.pdfIn PDF document text
    • http://xewaxal.epizy.com/61315482748.pdfIn PDF document text
    • http://dafiwogi.rf.gd/bach_well_tempered_clavier_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/satudifin/formal_letter_to_canada_immigration.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_off0000da88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA88 5220 bytes
SHA-256: 2c03b8a00b5de01fd4c81e027cd56fc9cf25622f4b6459e1724fa5e9b2c469e1
font_01_sfnt_off0000ec52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC52 11236 bytes
SHA-256: 760ef0677329517b548d9a28b26f26b4fea31c6919e7055c6cd6e8892f607d08

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