Malicious PDF — malware analysis report

Static analysis result for SHA-256 da57ae39358fb16f…

MALICIOUS

PDF

65.8 KB Created: 2020-12-08 13:41:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1b2541b088ad95bbe59b3b96cb66ea2e SHA-1: e7c10905dbbab0d57270a74190acb7b283f4f9f9 SHA-256: da57ae39358fb16fd7b43f50f75fb8e4f423ac6084eac3113676c8c97cf796c4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a link farm and an external URI. The embedded URL `https://trafffe.ru/strik?utm_term=speed+simulator+codes` is likely the primary lure, directing users to a malicious site. Although no scripts were explicitly extracted, the PDF structure and the presence of external links suggest an attempt to redirect users, aligning with phishing or malware delivery tactics.

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://trafffe.ru/strik?utm_term=speed+simulator+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368962/normal_5f8a4775bc57d.pdfIn PDF document text
    • https://ramitafot.weebly.com/uploads/1/3/4/3/134340854/9216112.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/4ac681ac-974d-46f0-9e78-9b94b1ae101e/sodium_bicarbonate_molar_mass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ad5cb21-9f54-49fc-95c3-c26cd8d2bea5/cuisinart_dlc-7_super_pro_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de6033b2-199e-4824-bfce-fbdea6a2812e/nacho_bell_grande_calories.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fcde108-d017-4038-ba4b-9c34a5948717/european_diabetes_guidelines_2014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57dc1998-fd80-4dd0-85b6-51467e2292e4/zobokiponoz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a830d231-8acf-44d1-bfb4-1c2fdb26ca59/7595182947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e97d462e-82f3-495c-9c32-fc2d0e3372d8/6974322617.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb646a9-d4a9-4b76-bcec-8c983debf088/words_per_minute_for_reading_aloud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7873d983-c4fe-4fb7-89bf-4f6656b7a37d/vasusadepakinejulozokovi.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_off0000c402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC402 5324 bytes
SHA-256: 2af48631d1c36a6600e20927a970b608631b1e53fb11ad89dfa8d3e97b14a73e
font_01_sfnt_off0000d602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD602 10948 bytes
SHA-256: 0c7305ca6491c57ffc030b5220b2d7cc2bf438704bf28f5c0080e37c6700e240

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