Malicious PDF — malware analysis report

Static analysis result for SHA-256 608dc15fd70aaf6d…

MALICIOUS

PDF

65.9 KB Created: 2020-11-24 15:59:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 802e8f971e6ec8e7a1cd3803c741e2b3 SHA-1: e9a3b6226595f56761d94c32739e3f01ae25a87c SHA-256: 608dc15fd70aaf6d54cecf86a2d7e2a4861d2e52ca1bcd831ca2f60c75aa6462
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links, identified as a PDF link farm and flagged as malicious by ML classifiers and ClamAV. The document body is heavily obfuscated but the presence of URLs like 'https://trafftec.ru/strik?utm_term=robertshaw+rs+2110+manual+espa%25C3%25B1ol' suggests a lure to external content. The PDF structure and link farm behavior are indicative of SEO spam or phishing tactics, likely aiming to redirect users to malicious sites.

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://trafftec.ru/strik?utm_term=robertshaw+rs+2110+manual+espa%25C3%25B1ol PDF link annotation
    • https://bipakevulof.weebly.com/uploads/1/3/4/6/134602937/zegodatigolukupiwipi.pdfIn PDF document text
    • https://junafoxotoroj.weebly.com/uploads/1/3/0/7/130738975/96827f.pdfIn PDF document text
    • https://papukelub.weebly.com/uploads/1/3/4/6/134666119/1592233.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_5fb74fc70045e.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/8358254.pdfIn PDF document text
    • https://mikezexevi.weebly.com/uploads/1/3/4/5/134528008/nemofasol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/best_admin_bootstrap_templates_free.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/netflix_premium_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e19b983-ffa4-4874-90a4-696e5f4c24d0/fixilapipatobo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93b3fc1d-a6bc-4503-a349-e6ceae1f27f9/chapter_8_photosynthesis_crossword_puzzle_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/19371695068.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/99911437047.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/58020045386.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_off0000c0e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E4 5836 bytes
SHA-256: ebb1e8685ebfe5de48b692109b17bb7a44564d2d9e5f8a90d394c2540e391499
font_01_sfnt_off0000d464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD464 10564 bytes
SHA-256: 597ac2797fdbf9c7843762d4a1afdb13e420cc136f87ace35f819f8def70f3d8

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