Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a156ec26744276c…

MALICIOUS

PDF

75.6 KB Created: 2021-03-28 13:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 514d21e1b5c5959e2283f5775183ac20 SHA-1: 61105eecd90e5a7dcc57eaaf7ed7395e458525d2 SHA-256: 1a156ec26744276cf78904b638373d1be7a172538bee9ee5393123792a7998fd
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://mezovuduw.ru/wix?keyword=adding+and+subtracting+functions+worksheet+algebra+2 PDF link annotation
    • http://myfirstsite.xyz/what_is_the_difference_between_bosch_500_and_800_series_dishwashershf0rz.pdfIn PDF document text
    • https://waruzakelejabu.weebly.com/uploads/1/3/4/6/134600446/besiragogikoj.pdfIn PDF document text
    • http://sputnews.com/ten_commandments_worksheet_grade_32udhj.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/cjgqjat/dental_assistant_jobs_near_me_hiring.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/Rhcgga8/didi_rider_app_ios.pdfIn PDF document text
    • http://presentinsta.online/interview_questions_for_call_center_reps5oghy.pdfIn PDF document text
    • https://cdn.sqhk.co/togixulala/fgghggf/keystone_algebra_1_practice_test_answers.pdfIn PDF document text
    • https://pevusipifo.weebly.com/uploads/1/3/4/8/134863194/topopigasegamuji.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/7lqHjfF/monoj.pdfIn PDF document text
    • http://groby-ritual.online/20286920094qt8w2.pdfIn PDF document text
    • http://dektesheff.xyz/1639888786073l0y.pdfIn PDF document text
    • http://yewes.space/how_much_does_a_bmw_motorcycle_service_costedu0p.pdfIn PDF document text
    • https://kazirevuteguzug.weebly.com/uploads/1/3/2/6/132681824/vomewutivur.pdfIn PDF document text
    • https://cdn.sqhk.co/nisosawero/hhja1jb/acknowledgement_letter_for_receiving_documents_template.pdfIn PDF document text
    • https://mimitokiwunas.weebly.com/uploads/1/3/4/0/134012498/sefusu-mawijesanezu-latuwo-sasenuvivepemiw.pdfIn PDF document text
    • https://cdn.sqhk.co/fezifoxunif/fOhfdZk/battleship_game_template_printable.pdfIn PDF document text
    • http://mivetys.xyz/17072575247q8mhs.pdfIn PDF document text
    • https://cdn.sqhk.co/tamaladafa/jhgicgh/mobile_recharge_offers_airtel.pdfIn PDF document text
    • http://prod-fruit.space/boladajelalumunekufzmp1.pdfIn PDF document text
    • https://rotolakudezi.weebly.com/uploads/1/3/4/0/134041133/wosak.pdfIn PDF document text
    • https://cdn.sqhk.co/wemupaxuziv/Vhehdji/example_of_what_s_to_come_crossword_clue.pdfIn PDF document text
    • http://woodlesenka.ru/skyrim_se_pc_mod_listh1cea.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/jehhjdo/kixegazogotudori.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000eaeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEB 5700 bytes
SHA-256: 7f2d4e0448d285026137027627152aaa071339277ec31ce2b9d8c844fb481fd7
font_01_sfnt_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 9900 bytes
SHA-256: a396bc3910202542bec4eefb92c4ba1c8ee16eea2b7a6b5303fb6757bbf6e77a