Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a5b5e3f7f115081…

MALICIOUS

PDF

75.0 KB Created: 2021-02-27 14:45:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5684da1f6710c26a76bd87c03add9270 SHA-1: a7286136a8eb53bd24d5b4b0c18935f78d686809 SHA-256: 4a5b5e3f7f11508109dea8e70dce7219f50bf82a2113332a42f3ecea591d19bc
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or spamming operation. The presence of a 'utm_term' parameter in one of the URLs indicates tracking, further supporting a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://dugedepap.ru/strik?utm_term=why+are+my+studio+speakers+buzzing PDF link annotation
    • https://zezowamizafomex.weebly.com/uploads/1/3/1/3/131381240/bifusavub_tobiw_vikegizijos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467955/normal_6024cb1b006ee.pdfIn PDF document text
    • https://sagagedonu.weebly.com/uploads/1/3/4/0/134017332/795785.pdfIn PDF document text
    • http://sopugepibimel.mypressonline.com/boxedemefabevowavabol.pdfIn PDF document text
    • https://cdn.sqhk.co/gewowamizes/iaPjhjj/73559783201.pdfIn PDF document text
    • http://sisamow.iblogger.org/is_ghost_recon_breakpoint_cross_play.pdfIn PDF document text
    • http://soldonlittleton.com/emma_jane_austen_film_kate_beckinsale7gvav.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/4geijif/ms_word_link_to_previous_section.pdfIn PDF document text
    • https://naxigekaserudo.weebly.com/uploads/1/3/4/6/134644932/gijujepujosol-wujomuwaje-tejixela.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/story_description_examples_tagalog.pdfIn PDF document text
    • http://numulul.mygamesonline.org/44420261466.pdfIn PDF document text
    • http://xajifefule.iblogger.org/20032141616.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491155/normal_60275c3eb6a7b.pdfIn PDF document text
    • http://doloxuwukur.iblogger.org/25075705896.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/idieRrD/dr_phil_soundboard_ebaumsworld.pdfIn PDF document text
    • https://fobijolosa.weebly.com/uploads/1/3/4/7/134730704/3dd60d5f67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388596/normal_5ffe0cedcae69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447497/normal_601db4416d401.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://magegefopo.atwebpages.com/gejawekero.pdfIn PDF document text
    • http://pefodajisotavuk.rf.gd/mavofawaxowemadikurufim.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/nancy_drew_clue_crew_book_reading_level.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_off0000e795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE795 5712 bytes
SHA-256: 5aa2b6db7f52afbb1856237551ee80ee7ff1bd4c87ff084a0a22f4a570195721
font_01_sfnt_off0000faf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF3 10580 bytes
SHA-256: 772bf3c8ff26e6c4dd2293567b3f8c11423eb6734af63f658c205f919abd3eb8

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