Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05397c7797e5dd9…

MALICIOUS

PDF

66.8 KB Created: 2020-12-30 22:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 16af0f580b9564eb72a0bbea68cc00e5 SHA-1: 63eb643c24d2a034650a8d4854012c6610cb25fa SHA-256: c05397c7797e5dd96aceab2a7ee7ad0ebeba69fe9e42b7f126f41ad13e6cb1d1
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms or phishing lures, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The embedded URLs point to various Weebly-hosted PDF files, likely serving as part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffset.ru/123?utm_term=peskin+and+schroeder+solutions PDF link annotation
    • https://fidevawane.weebly.com/uploads/1/3/0/8/130814252/bibaxa.pdfIn PDF document text
    • https://punelita.weebly.com/uploads/1/3/4/6/134679726/00a37d68.pdfIn PDF document text
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/6858376.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/gurizas_gimarojem.pdfIn PDF document text
    • https://degijidugaf.weebly.com/uploads/1/3/4/8/134886203/gifijelukos.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/17755433-98fe-46d7-aefb-abfbe57cff85/nuvev.pdfIn PDF document text
    • https://s3.amazonaws.com/fufaragebo/algebra_and_trigonometry_structure_and_method_book_2_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fae40b7-5f13-4d5b-94a2-ffdaf88bb5e8/ruserit.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/crackers_and_cheese_gift_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9450fa2d-fbde-417e-898b-60786fba7854/algebra_2_inequality_word_problems_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/bleach_brave_souls_apk_mod_spirit_orbs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b2a2e9-390b-4250-8064-a725bbfd3349/60547593050.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_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 5092 bytes
SHA-256: 243fac7a3d8475aef7f16eeb0301dad30fdffcade3632f043e474465c7966089
font_01_sfnt_off0000daba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABA 10556 bytes
SHA-256: 4a70efe93253e0896e7ece42e31cf634f642cf02cce2a92638858ac7f3170180

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