Malicious PDF — malware analysis report

Static analysis result for SHA-256 167dd09228f43f1d…

MALICIOUS

PDF

83.5 KB Created: 2021-03-15 11:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ad36c72afc6231694b1e615f25a8025b SHA-1: c6aadf3937f3dd9fa18a50cc77dc8a989c02f608 SHA-256: 167dd09228f43f1d837f26fdb27048e1ff2be3ed810ab656822d0230c6e18f27
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://pelibifir.ru/123?utm_term=definition+of+sonata+allegro+form PDF link annotation
    • https://cdn.sqhk.co/tigepukeri/bidPjgc/vemolojipazufo.pdfIn PDF document text
    • https://cdn.sqhk.co/laxepinam/3hdi3ha/rtc_bus_schedule_5.pdfIn PDF document text
    • https://cdn.sqhk.co/zolulesar/Rhgojdu/nopagi.pdfIn PDF document text
    • https://cdn.sqhk.co/lojibuwe/eib7Dij/tafl_board_game_for_sale.pdfIn PDF document text
    • https://cdn.sqhk.co/lakabarobuk/mVP2QmI/certificate_of_conformity_car_usa.pdfIn PDF document text
    • http://zesisoxesevi.22web.org/kahoot_hack_answer.pdfIn PDF document text
    • https://fejigurize.weebly.com/uploads/1/3/4/5/134509658/wimevigopajip.pdfIn PDF document text
    • https://cdn.sqhk.co/benadujeju/ghaDnje/fojipukik.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/chapter_4_practice_test_chemistry.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/what_is_an_example_of_a_distributed_system.pdfIn PDF document text
    • https://cdn.sqhk.co/pawekenu/WibqjeT/celebrity_cruises_canada_sign_in.pdfIn PDF document text
    • http://kovamuwaropepu.getenjoyment.net/dunilobixamutakoxidax.pdfIn PDF document text
    • https://cdn.sqhk.co/jevipugirofi/3WXha3H/nuwufo.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/hIdgcjj/lokeriminu.pdfIn PDF document text
    • https://turarizamagux.weebly.com/uploads/1/3/1/4/131453837/aab1677296544c.pdfIn PDF document text
    • https://cdn.sqhk.co/rapurakoke/IGhbdkU/roads_of_rome_1_play_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xogeloke/ahhifgj/tebiloxakesojerelapaworu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vawirir.atwebpages.com/policy_paradox_the_art_of_political_decision_making_3rd_edition.pdfIn PDF document text
    • http://mutojux.epizy.com/apparitions_ghosts_of_old_edo.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_off00010aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA2 5084 bytes
SHA-256: fed4fc832979dbb2c3c5615c1f6ba567734d666f219ee4b2c2f57dde4585938a
font_01_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 11036 bytes
SHA-256: e1f469d54d48f7dc731b7665f509074f84c99f215eb1c171517f5ac988c20611

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