Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b0d70d9614dd2f…

MALICIOUS

PDF

74.3 KB Created: 2020-12-16 19:15:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2f1e2147ab0b001e478fbdb18fe891fd SHA-1: 80455719b4c7506cddf24b39a0ad144a478819f0 SHA-256: 31b0d70d9614dd2f4e8d6e44d55e99229d7f3a91989bbd11797ef1c131cb2104
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, with one pointing to 'traffnew.ru', suggesting a phishing or SEO abuse attempt. ClamAV and ML classifiers also flagged the file as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://traffnew.ru/123?utm_term=toys+r+us+tot+tutors+table PDF link annotation
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/dekodirala.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/4ac25d74-75a6-41c0-80e5-0e977696a165/bavuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af9bdd26-4ae1-435b-afb6-5f2ce37d27e3/101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a3005b-23fa-4c56-b6a6-b28f24ccc3a2/segajadewadudisitununuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/856c4de9-995e-4ec6-a588-2e9b3cb3a981/gunther_gebel_williams_circus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39f5d64-d388-4809-852b-288c96fb68ec/best_tv_guide_for_kodi_18.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe03b5145a8629dc774325/1606288310776/21261013954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c1119b-f752-46aa-9e20-73841c3610dd/rose_poem_funeral.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f758dbbb-3311-4845-bcc9-d83145d9de14/alfreds_all_in_one_piano_course_level_1.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/nysora_infraclavicular_block.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d4f339a-4e7e-4804-8a4f-c87effa1fac9/41208513797.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/047a5f41-6189-4a56-8b59-17889f2fd689/raven_progressive_matrices_answer_ke.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBB4 4872 bytes
SHA-256: a9e2b37d386b71852ee5fc6d16407dad9f5dfc9a23f5e4977510eb3dad4cc798
font_01_sfnt_off0000dc57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC57 10840 bytes
SHA-256: f76d9de09323e3861962fee87bd03dafb835e9f26b628c857b0ee5bdea433113
font_02_sfnt_off0001019e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019E 17060 bytes
SHA-256: 2eba13bdfead8d5a336bd7fead1b07c7317a5eb62405c109749de959fe3e3b97

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