Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c004bcae2ee4b8f…

MALICIOUS

PDF

69.6 KB Created: 2020-11-14 10:53:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 83896515926013abd29e59d9f94df681 SHA-1: 745c91215341edfc6e1e993371edae55aa153a95 SHA-256: 7c004bcae2ee4b8fab772c318e88d833db9c43e586c10d26de74c661f15831d6
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, with one prominent URL pointing to 'trafffe.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/aws?utm_term=mystic+messenger+guide+zen+route
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/sinamiripusiwot.pdf
    • https://cdn-cms.f-static.net/uploads/4409417/normal_5f9f935dd0fdc.pdf
    • https://cdn-cms.f-static.net/uploads/4365567/normal_5f9d4e35c572d.pdf
    • https://pivuwexigika.weebly.com/uploads/1/3/4/3/134320842/vujeta.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pusolefosex/sosozozirusenogekojuv.pdf
    • https://uploads.strikinglycdn.com/files/3b4ce25a-2863-432f-9d91-b99335b18909/56535088247.pdf
    • https://s3.amazonaws.com/jeponowon/hotmail_sign_in_to_mailbox.pdf
    • https://uploads.strikinglycdn.com/files/288ba76a-c2dc-43a5-9dcd-6819def4e3a9/21549515961.pdf
    • https://s3.amazonaws.com/janodojivi/gotonidavufasudafeb.pdf
    • https://uploads.strikinglycdn.com/files/8027d8af-7ee1-4496-ac1e-7212c75c39a8/soguti.pdf
    • https://s3.amazonaws.com/dujepav/english_test_past_simple_and_continuous.pdf
    • https://uploads.strikinglycdn.com/files/14a03a7b-9049-4169-9df1-80577c826fb6/unit_4_progress_check_mcq_ap_us_history.pdf
    • https://s3.amazonaws.com/zomuzigo/apparel_industry.pdf
    • https://s3.amazonaws.com/wepeliniru/clackamas_high_school_teacher_website.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_off0000d147.bin
65f28b2eb092c3c844f70ac3e92dacf7946fffa9af241ba43ed23339dfbe027e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD147 5176 bytes
font_01_sfnt_off0000e2e7.bin
2becd3cd42d2218a379e385752304e205cb1ad159d3f0c2980f7a828cae78156
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E7 10908 bytes