Malicious PDF — malware analysis report

Static analysis result for SHA-256 39681f51a99d631c…

MALICIOUS

PDF

81.8 KB Created: 2021-06-11 02:15:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 4b49c31bfce4fa48e615d94dcbb4d639 SHA-1: 695f0556836fa56fd11b2dbe234cbb991b60c0ef SHA-256: 39681f51a99d631c2f97cb0601be372e62dd90569eb36f9466aa3b0919e6eef2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, with a primary one pointing to a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'music general knowledge quiz questions and answers', likely to entice users to click the malicious links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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://catamma.ru/pbw?utm_term=music+general+knowledge+quiz+questions+and+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453333/normal_60bfee79ee440.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5fcfad81cac6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_601a461892b5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465007/normal_6006ff7f5ec06.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372982/normal_6000aff0439c7.pdfIn PDF document text
    • https://bonizilolalov.weebly.com/uploads/1/3/4/4/134458774/bebopofijesud.pdfIn PDF document text
    • https://bukowimulo.weebly.com/uploads/1/3/1/4/131407836/mazonupaguxazo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457582/normal_6021f9121a0c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_60bc23036e86a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499309/normal_601ab3d0e7c5e.pdfIn PDF document text
    • https://maninuwag.weebly.com/uploads/1/3/4/5/134577581/3902830.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/46536ba7-39d0-4a6e-8f2f-4dd16f8207c9/wormate.io_mod_apk_4.0.3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33779205-df1e-4690-968a-e9d9d46be84f/60837720567.pdfIn PDF document text
    • http://wukexav.pbworks.com/w/file/fetch/144870714/when_did_the_idea_of_prison_labor_begin.pdfIn PDF document text
    • http://tanoroxamo.pbworks.com/f/31409481183.pdfIn PDF document text
    • http://poguvovuk.pbworks.com/w/file/fetch/144872469/colligative_properties_worksheet_chemfiesta_com_answers.pdfIn PDF document text
    • http://dijakezepo.pbworks.com/w/file/fetch/144870357/odysseyware_geometry_test_answers.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/f/waec_further_maths_past_questions_and_answers.pdfIn PDF document text
    • http://viruniruxo.pbworks.com/f/64647178337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb8f81b4-aa23-4708-9599-c4357a6917c6/vintage_magic_chef_stove_models.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/physics_objective_questions_in_hindi_download.pdfIn PDF document text
    • http://bukafag.pbworks.com/w/file/fetch/144497787/62167871311.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_off00010248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10248 5444 bytes
SHA-256: d44e13fcdc881f9c61bbfab7b2a53220586f912a07b23c2e3c29be44728512c2
font_01_sfnt_off00011502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11502 10892 bytes
SHA-256: b296d0685f7d9c6b6bf2a75b8da9a332d76bef798693f8d43f09d54b1a4b89f7

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