Malicious PDF — malware analysis report

Static analysis result for SHA-256 af002487a4e52d99…

MALICIOUS

PDF

97.4 KB Created: 2021-03-17 23:46:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d2a9cfe85333e0e92edacec23d751da7 SHA-1: 3759770aefcdffe2b6c2793f8918b2589cf1b568 SHA-256: af002487a4e52d999c62ce3050ab1caec9fdd503751e4e31e3248fac1296ddfd
134 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jacksth.ru/strik?utm_term=how+to+populate+a+word+form+from+excel PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372980/normal_60331ca1afcbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468537/normal_604d1538b25ae.pdfIn PDF document text
    • https://fetezubusob.weebly.com/uploads/1/3/2/6/132681625/kepisadanow_rizebi_geraveraw_wijukuvisunul.pdfIn PDF document text
    • https://virubavu.weebly.com/uploads/1/3/4/7/134755547/natepok.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425738/normal_5fcd25ded3a7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469106/normal_5fffce886ec6f.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/dobogototuw.pdfIn PDF document text
    • https://vumirexow.weebly.com/uploads/1/3/2/7/132740730/724492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386361/normal_60030389ce315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382953/normal_602ae5718755e.pdfIn PDF document text
    • https://zolopopi.weebly.com/uploads/1/3/3/9/133999976/misizawerudekerirej.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453129/normal_5fe4f4f92a3b8.pdfIn PDF document text
    • http://fujopijur.iblogger.org/paas_aao_na_song_pagalworld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375708/normal_60142c9ad42dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://tuwafexom.epizy.com/how_to_find_the_atomic_mass_of_an_element_using_isotopes.pdfIn PDF document text
    • http://vatugiw.epizy.com/10th_mark_sheet_2019_cbse.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/fagafomozebovavodapebu.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/51155560271.pdfIn PDF document text
    • http://gudenojotu.epizy.com/30804817050.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/biostatistics_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/management_accounting_objective_questions_and_answers.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B91 4972 bytes
SHA-256: 6f38948f0c279da9e5b18ea8b455bea2c7df71ae2d7de73dab83db2bbf1c4f0b
font_01_sfnt_off00012c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C99 11488 bytes
SHA-256: e6d905731d244e774b2f5301c34b69f07dd2e433581be658d0d6cd5fd8b095d6
font_02_sfnt_off00015407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15407 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00016937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16937 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c