Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9a2cfbcbd7fd3d…

MALICIOUS

PDF

73.3 KB Created: 2021-02-24 06:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 937f2673192e51928d17d566f398889c SHA-1: ce3b551505e829ec2cc804412c8ca48135800fdb SHA-256: cb9a2cfbcbd7fd3d6cc44a0cb5a8936f4bc83d7bf57f36f15a581d7e84354028
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful content.

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://leonvi.ru/strik?utm_term=the+magus+marvel PDF link annotation
    • https://fenorepaxok.weebly.com/uploads/1/3/1/8/131856491/gonezovof.pdfIn PDF document text
    • https://nujokolove.weebly.com/uploads/1/3/0/8/130874035/6461834.pdfIn PDF document text
    • http://mkuu.club/counter_strike_1.6_cd_key_ifresihmg6q.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479691/normal_5fdb531d980c7.pdfIn PDF document text
    • http://duduzojezojak.22web.org/87253373418.pdfIn PDF document text
    • http://luminar4-download.xyz/96137602722gjrjy.pdfIn PDF document text
    • https://cdn.sqhk.co/tesigasefaxe/jchfWjf/16098305297.pdfIn PDF document text
    • https://musigimipipo.weebly.com/uploads/1/3/4/4/134470090/7285743.pdfIn PDF document text
    • http://copyright-supporthelp.com/vivitar_bluetooth_speaker_vu60014bt_manual074sd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376852/normal_600ebd072042a.pdfIn PDF document text
    • http://alteramaks.world/subway_customer_service_phone_number_canadan8xob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://soreras.epizy.com/xunulawa.pdfIn PDF document text
    • http://fikuluki.epizy.com/what_is_a_4_card_flush_in_cribbage.pdfIn PDF document text
    • https://s3.amazonaws.com/boxalewijim/birizepobifamuvubazibol.pdfIn PDF document text
    • http://xofukadebinomo.epizy.com/how_to_set_the_time_on_a_g_shock_watch_wr20bar.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/sekekovesikujufe.pdfIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/20714590108.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_off0000e1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AB 5108 bytes
SHA-256: a7f1cac74835d6e5843a39eae36b15334b8ecf379823c7e4ab48c3fca77f2b2c
font_01_sfnt_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 11036 bytes
SHA-256: 19f750b61ada450644c7646a3d6040dfc8fa9a607316a2ad6ee3fa288dc24541

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