Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ef2c7afa9f69f76…

MALICIOUS

PDF

73.4 KB Created: 2021-04-19 13:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f727cdbfd24a07b7a4b131e7d7021e98 SHA-1: 7fc8a1a068d42b665510fff8ca2986173c7336e3 SHA-256: 3ef2c7afa9f69f764839067a95fef0952a0e5d15fcdcff7e8c3e548bc2bfbd89
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or redirectors, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URIs points to an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 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://botokaw.ru/strik?utm_term=audio+technica+lp120+setup+reddit
    • https://nimekeboxiz.weebly.com/uploads/1/3/0/8/130873861/sekebasaj.pdf
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/jamafalavalener_zuvijup_lugijova_feribekabudu.pdf
    • http://lovefoxesi.iblogger.org/12911181458.pdf
    • https://pofunowiri.weebly.com/uploads/1/3/3/9/133997400/8352089.pdf
    • https://tawugeri.weebly.com/uploads/1/3/4/7/134774142/2246409.pdf
    • https://nuduxojobiri.weebly.com/uploads/1/3/4/6/134629521/0de4f3332dc7.pdf
    • https://jugusunoju.weebly.com/uploads/1/3/4/6/134625161/8275937.pdf
    • http://winokuzovew.iblogger.org/rogotofoxixisorowed.pdf
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/fuxuzoberutuw.pdf
    • http://gokawojop.scienceontheweb.net/behaviorist_theory.pdf
    • https://xojisige.weebly.com/uploads/1/3/1/6/131637148/9940222.pdf
    • http://nibakelenixezas.getenjoyment.net/4730068107.pdf
    • http://mezogevap.mypressonline.com/cancer_sign_and_symptoms.pdf
    • https://vejiledulibona.weebly.com/uploads/1/3/4/3/134318828/4191843.pdf
    • https://dopilefuma.weebly.com/uploads/1/3/4/7/134733068/ca8316e4d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bufexa/does_mad_sweeney_die_in_american_gods.pdf
    • http://faxajipemafeb.epizy.com/ralimigejokesasanok.pdf
    • https://s3.amazonaws.com/nijosinizo/royal_betting_tips_vip_apk.pdf
    • https://s3.amazonaws.com/gajakelegeza/husqvarna_128ld_carburetor_settings.pdf
    • http://pimimozoji.myartsonline.com/41297985468.pdf
    • https://fc9a8e44-b853-4378-b933-957c6fa9ceda.filesusr.com/ugd/1da781_e4fb32c59464480799dc96a04511569b.pdf?index=true
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_3679dec9758a4fb78ccc314eba626a89.pdf?index=true
    • https://s3.amazonaws.com/napoledunadigo/30062309649.pdf
    • http://tiwubove.epizy.com/zovimifexuwa.pdf
    • http://gadubuwarin.epizy.com/advanced_computer_architecture_kai_hwang_2nd_edition.pdf
    • https://8ecf7690-1f99-4e28-a4b6-3228ba9731d7.filesusr.com/ugd/63d3ad_73c8835c722a4d05adfa3bfa76fd3a9d.pdf?index=true
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_d264ac5215874fdc8526fbad1640ee02.pdf?index=true
    • https://3857ddc0-2b33-46ba-b4a8-ebef9b167687.filesusr.com/ugd/5cc0d5_5e82ad4d750a401f9ffc97651fba34a8.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e128.bin
13c47aee528fb4e1d2dce553e954c56efaab02d4ddcba326bde55747e296576f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 5476 bytes
font_01_sfnt_off0000f3c3.bin
d9d56981b79f0ac7d4f95a5087b9468e86da99735eaeff7a17df2b717070ad13		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 10544 bytes

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