Malicious PDF — malware analysis report

Static analysis result for SHA-256 552370e518718edc…

MALICIOUS

PDF

81.6 KB Created: 2021-03-01 22:14:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f79200e35653f445d8b0d69a924e2317 SHA-1: 981a8ff8e13165040561f94905fbb896cffa1923 SHA-256: 552370e518718edc51b584f5c7bffbf2609bdb6a27d608149d7c7a1ac0d1c03d
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with at least one pointing to a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign.

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/123?utm_term=walmart+indoor+tv+antenna+reviews PDF link annotation
    • http://muvirire.22web.org/quimica_inorganica_catherine_housecroft_portugues.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460725/normal_5fd6407f5bfec.pdfIn PDF document text
    • http://gukabibus.mygamesonline.org/vudotekul.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/how_to_take_apart_a_treadmill_nordictrack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448540/normal_603becf3831e9.pdfIn PDF document text
    • http://voirly.xyz/fire_prevention_week_2019_printable_worksheets6faq0.pdfIn PDF document text
    • http://mebesovinu.22web.org/fomudu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456372/normal_5fcd969b48246.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fopagozijudiri.epizy.com/49830255124.pdfIn PDF document text
    • http://pudopidurisego.epizy.com/intimate_apparel_play_characters.pdfIn PDF document text
    • http://kesufelitam.rf.gd/jurassic_park_theme_sheet_music_baritone.pdfIn PDF document text
    • http://lixanixuzuki.rf.gd/tapping_auto_clicker_6._0_apk.pdfIn PDF document text
    • http://jorowiwiboxizuk.rf.gd/model_boat_building_plans.pdfIn PDF document text
    • http://dijijesuwaxon.epizy.com/rusod.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_off00010387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10387 5136 bytes
SHA-256: 86cf29ae4f3c53c8c873a390d81755c8c61a9e2dcea933098d46de71f83c64de
font_01_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 10668 bytes
SHA-256: 7b8ddd7522e1c325c5e52325a0096cbc7907763b298bdcd5e46772d33d41ba90

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