Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c920519a7a7be54…

MALICIOUS

PDF

79.9 KB Created: 2021-05-03 22:01:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9a25a6253818c7b513d554bce1e2b98e SHA-1: 6a89b6927a4aaa118e915cd3cc5c4c889ffdab67 SHA-256: 7c920519a7a7be5433b2f4716b8682ee0a6d4fb0221eded26c86713c004417be
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL and the heuristic findings point towards a phishing or malware distribution attempt, likely using the document's content as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xezojetit.ru/strik?utm_term=agatha+christie+movies+2020+netflix PDF link annotation
    • http://pivojapigalotu.22web.org/wetexofadotizokedefag.pdfIn PDF document text
    • http://cetop.xyz/60513918452i97el.pdfIn PDF document text
    • http://citrus-fruit.space/i_inch_binder_spine_templatesbs3vh.pdfIn PDF document text
    • https://cdn.sqhk.co/sadudolamom/deHhfjd/iycf_guidelines_on_complementary_feeding.pdfIn PDF document text
    • https://cdn.sqhk.co/nulupitet/3Nihji2/93257042200.pdfIn PDF document text
    • http://mybestchan.online/what_are_kind_words_that_start_with_the_letter_yhiiy0.pdfIn PDF document text
    • https://ruvofoxodade.weebly.com/uploads/1/3/0/7/130738615/rirujipunopag.pdfIn PDF document text
    • https://tezonebikinigax.weebly.com/uploads/1/3/1/6/131637870/liwoneg-zudesuxidekasus.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/cihhiih/play_literacy_classroom.pdfIn PDF document text
    • http://legarojute.iblogger.org/english_grammar_book_in_gujarati_language.pdfIn PDF document text
    • https://xidelefexowivap.weebly.com/uploads/1/3/4/3/134366840/xalupubefufo_loxovibezi.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/DigicGA/gimorarusowozeg.pdfIn PDF document text
    • https://kuzogirig.weebly.com/uploads/1/3/4/7/134748708/gadujusunonazi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae9fd5ab-9d96-4cdc-94ca-52be481f7825/28232368581.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c912bf33-632b-49ff-9261-631563eee580/how_to_do_quick_maths_calculation.pdfIn PDF document text
    • http://mewiwujudulixe.epizy.com/potutinaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7032a028-b002-4302-9e23-83ba6eb2a7ec/dbx_driverack_pa_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/965d5d4f-02f1-4f39-9627-73be251d3381/zexuvopafinapimubiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d891c37-3f4e-4184-980b-e8515b0195ff/17286348807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08b8a38-1181-4d1a-8a17-90c84f174ccb/wububetivumewiseredazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c120f8c-ffbb-4e0f-a9c2-253d4c629ea7/reasoning_ability_questions_and_answers_for_bank_exams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76a5f637-115e-4399-b4ad-745a40f9632b/synonyms_and_antonyms_worksheets_for_grade_5_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55cb60b-e798-435d-afc5-b94eafcd23e7/what_to_say_instead_of_itll_be_okay.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_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 5684 bytes
SHA-256: fd5f943bcb64004af4002f1a40904da08c6f4c6d07f93e5b7a38ec2b7be0c780
font_01_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 11140 bytes
SHA-256: c0090eadde07c1fc28efff3f71cb2c09672fb87ebc3e43b4a0eb2f96e0bbc298