Malicious PDF — malware analysis report

Static analysis result for SHA-256 95e58d243562dc26…

MALICIOUS

PDF

75.9 KB Created: 2021-06-01 18:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44276d632174c20405b2e17383c2c292 SHA-1: b60856b92a0fdf96377714b9a31515d5d239ef57 SHA-256: 95e58d243562dc26a594ab719b5e49cdb9f8be5b028827d3fa6f5f84207a17c7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, a technique often used in SEO spam or phishing campaigns to drive traffic to malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically identifying it as a phishing trojan. The embedded links, such as 'crewmak.ru', are likely intended to lead users to further malicious content or scams.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crewmak.ru/pbw?utm_term=what+is+qualcomm+atheros+ar956x+wireless+network+adapter
    • https://cdn-cms.f-static.net/uploads/4388276/normal_60368a8336a07.pdf
    • https://kozamenarolu.weebly.com/uploads/1/3/2/6/132682647/xafadabipowo-supef.pdf
    • https://cdn-cms.f-static.net/uploads/4412895/normal_6068cd5fc3188.pdf
    • https://cdn-cms.f-static.net/uploads/4451019/normal_602d9ff51266b.pdf
    • https://cdn-cms.f-static.net/uploads/4450635/normal_6011e95379b88.pdf
    • https://bavobero.weebly.com/uploads/1/3/4/5/134585538/tezejotagu_bunar.pdf
    • https://cdn-cms.f-static.net/uploads/4369907/normal_60367c63204ce.pdf
    • https://cdn-cms.f-static.net/uploads/4412905/normal_6060487d16016.pdf
    • https://static.s123-cdn-static.com/uploads/4412573/normal_5fce5238c021e.pdf
    • https://nozirurabi.weebly.com/uploads/1/3/0/7/130738896/luxewafetiza.pdf
    • https://xotugakifegug.weebly.com/uploads/1/3/4/1/134131530/pazeputavixedoserosa.pdf
    • https://static.s123-cdn-static.com/uploads/4369323/normal_5ff97dce2e038.pdf
    • https://jilarikogezinuv.weebly.com/uploads/1/3/0/9/130969280/ecdc6ebe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pevozowo.pbworks.com/f/77578057022.pdf
    • https://uploads.strikinglycdn.com/files/94e38d65-dbbf-4870-93e7-2306673db464/68117668730.pdf
    • http://sodopateduke.pbworks.com/w/file/fetch/144424710/75349260745.pdf
    • https://uploads.strikinglycdn.com/files/bd4be8be-d0a6-458c-8bc5-0333a362bff5/the_tempest_ariel_quotes.pdf
    • https://uploads.strikinglycdn.com/files/dd05f925-e4b5-4343-ac0e-f0f3e832e0c4/kesarimokoluwawinaxisa.pdf
    • http://pugaxigodaka.pbworks.com/f/21915982964.pdf
    • https://uploads.strikinglycdn.com/files/16684f81-cb4b-4f5d-b2a4-25d3dfea41eb/84227191577.pdf
    • https://uploads.strikinglycdn.com/files/f6b67bf5-31c7-46a2-81be-5f332974903c/true_metrix_blood_glucose_test_strips_uk.pdf
    • http://xawaren.pbworks.com/f/44385990619.pdf
    • http://zufumegi.pbworks.com/f/what_are_the_duties_and_responsibilities_of_a_finance_officer.pdf
    • 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_off0000e9ef.bin
973293d64e9c341889eee82207200d087ded45d4980d6dc1e0675dbb07394025
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 6112 bytes
font_01_sfnt_off0000fea6.bin
4e88bcb585bd23f89c8da86329894e185f1e1a75710c4f1c1eddd0cab356843e
pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA6 10496 bytes