Malicious PDF — malware analysis report

Static analysis result for SHA-256 35efa2e329013308…

MALICIOUS

PDF

71.4 KB Created: 2021-03-10 23:57:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 962b9c94ae5f5370b2c8f024ca3b8d1c SHA-1: 5f91126acffbedb3c5ea40ff2737e6cb1c007a23 SHA-256: 35efa2e32901330877532406905c60123b798f3fd5d35105ac8c2ffd30ee4bd7
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 0.9997

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://druttle.ru/award?keyword=airport+vocabulary+english+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/nenakowi/hg8jbij/90959275757.pdfIn PDF document text
    • http://rasidafepu.mypressonline.com/curriculum_development_agencies_in_nigeria.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/6092964947.pdfIn PDF document text
    • http://nesibobivugo.iblogger.org/spring_boot_oauth2resttemplate_refresh_token.pdfIn PDF document text
    • https://cdn.sqhk.co/bulenupulabo/egd9zbz/mit_app_inventor_emulator.pdfIn PDF document text
    • https://cdn.sqhk.co/feduminaro/Pjivijd/fighter_jets_air_strike_game.pdfIn PDF document text
    • https://cdn.sqhk.co/lukisebeka/ghhe29F/tizumebatotanobutofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cdb29d4-22ce-4aaf-9e51-562b59d50851.filesusr.com/ugd/1b20fb_b38907ade16042beb6b9f55a64c9756f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ec758b-d336-4ad8-a7e3-d2b593222a3e/29906996154.pdfIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_6cc694976fe64fdca97953b9953f25ae.pdf?index=trueIn PDF document text
    • https://09972071-4174-499b-90b1-de3619f59f53.filesusr.com/ugd/d1c05f_4c6139846fb540d285ec644187a3d202.pdf?index=trueIn PDF document text
    • https://8772a198-af03-49ef-8724-5feb7546cb8a.filesusr.com/ugd/436f04_f406d52c7a10447ba6be1ad03efbeaed.pdf?index=trueIn PDF document text
    • https://60f6da8c-824c-4163-aae9-6195f2ac7ed4.filesusr.com/ugd/7f16bd_8503021290a349b08596e438185b9eb5.pdf?index=trueIn PDF document text
    • http://duziroro.myartsonline.com/pocket_juice_hand_warmer_walmart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b6513da-4b4c-483a-9c31-c8847ca85fbd/dogokawizesekuxanujeli.pdfIn PDF document text
    • https://6ec3981f-6443-463b-a164-91fc69f101d9.filesusr.com/ugd/7603ae_7803a218c0454678b391d7cec4e8a0b7.pdf?index=trueIn PDF document text
    • http://luxopemuvoxu.rf.gd/jorib.pdfIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_6a88f495fc874a1eb09b19773a9d0387.pdf?index=trueIn PDF document text
    • https://4253c66a-660d-4c83-b31d-f715833d547b.filesusr.com/ugd/d9e9a0_e280a944c8304ec7bb766af6b47a78bc.pdf?index=trueIn PDF document text
    • http://rovafitazilom.epizy.com/kafarupa.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/how_to_write_a_letter_to_the_parole_board_for_my_boyfriend.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_off0000daca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACA 5776 bytes
SHA-256: 097ad5e9d79638443ccd685dfbaf9ec03292a1d45b6ee56443c6568178e8d209
font_01_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 9836 bytes
SHA-256: f7ec26197398c9d1bef65169dd906b241c76c5c6664fa230afef038c8312a462