Malicious PDF — malware analysis report

Static analysis result for SHA-256 376e29d5e812ad67…

MALICIOUS

PDF

72.8 KB Created: 2021-05-02 07:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c530f5748ec820043816867558e695ed SHA-1: 21f3a6b64ba893670784194946e28aea6e76e5c7 SHA-256: 376e29d5e812ad678c8b555136d7e4bd12267b7b8cf10cc74bb74e729d80e9eb
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs pointing to disposable domains, characteristic of a link farm used for phishing or distributing further malware. No scripts were extracted, but the PDF structure and external links suggest it's designed to redirect users to malicious content.

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://midufefew.ru/strik?utm_term=python+list+remove+element+regex PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366978/normal_5fff5c9a6e0a5.pdfIn PDF document text
    • http://mexuloxuxinona.iblogger.org/couch_to_5k_plan_in_6_weeks.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/7736100196.pdfIn PDF document text
    • http://fovazewo.iblogger.org/coshh_data_sheet_for_emulsion_paint.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489058/normal_5fda81b5e98fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495976/normal_60281026e9d7c.pdfIn PDF document text
    • http://rarebuzoxexovom.22web.org/jajepi.pdfIn PDF document text
    • http://batmbatm.ru/new_bhakti_dj_song_2015k0n8g.pdfIn PDF document text
    • http://smirno.life/teluxasudabesot7194f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_605d9b9a1b0b2.pdfIn PDF document text
    • http://safetymirrors.xyz/fcc_part_95_rules9exb0.pdfIn PDF document text
    • http://midesamipazizuj.scienceontheweb.net/adobe_illustrator_cs6_myanmar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5fe37a563b311.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/67510578350.pdfIn PDF document text
    • http://nalirabagetovop.epizy.com/vizio_sound_bar_subwoofer_setup.pdfIn PDF document text
    • http://xukokumo.myartsonline.com/divajafidojaxul.pdfIn PDF document text
    • http://kapirexazi.onlinewebshop.net/cooking_merit_badge_worksheet_answers_2018.pdfIn PDF document text
    • http://muvusibose.rf.gd/glencoe_health_chapter_21_alcohol_assessment_answers.pdfIn PDF document text
    • http://fabosiregoz.rf.gd/cateter_venoso_periferico_2020.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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 5120 bytes
SHA-256: 1f5113a8db1303de9c39881fbe4b226ef9455a7fae32a0a8eeb5689c9457aea9
font_01_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 11452 bytes
SHA-256: 7b1a81ba04033d1238e67b7e3e8fb639ee666e3cc7c1fa8ecebff07a9d7aa411

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