Malicious PDF — malware analysis report

Static analysis result for SHA-256 28dd72c6becbc8ff…

MALICIOUS

PDF

64.0 KB Created: 2020-12-14 22:19:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 523a8428b6968c9a8bae00ddedb487e2 SHA-1: 229a26eaeb438f11f8e1336cecce882795703cd7 SHA-256: 28dd72c6becbc8ff8d9a5523ab4f294b72cf4bca0b15aacd201609d1b0566497
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by both ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with one prominent link pointing to 'trafffi.ru', suggesting a phishing or link-farming operation. The document body, though heavily obfuscated, contains metadata related to 'Gully boy imdb parents guide' and the authoring application 'wkhtmltopdf', which is often used to generate SEO-optimized content that can be used for malicious purposes. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffi.ru/aws?utm_term=gully+boy+imdb+parents+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5fca93bc3b98e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471083/normal_5fd0960eba936.pdfIn PDF document text
    • https://pesimavadedeto.weebly.com/uploads/1/3/4/7/134729205/budawezujetefagivob.pdfIn PDF document text
    • https://wosezobar.weebly.com/uploads/1/3/1/8/131856012/6484354.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/4b90ad7d-b8c4-4903-903c-5a0a3ce70711/blue_chihuahua_puppies_for_sale.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc5166417e7202640051625/t/5fcf2972509e863c682aed5e/1607412082977/dragon_raja_puppeteer_core_build.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c950a3a-e0d2-4ab9-9d7c-9a0ba3844b3a/putorewasenebipuzobase.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122b8d97-7a5f-4bdb-8ef5-3b380cb67b49/cnc_plasma_cutter_table_plans.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/pepolugazibutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/099a805c-1091-4ffe-958d-7a547fccc4de/zikazavaka.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_off0000bcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCC2 5552 bytes
SHA-256: 4b4014abd9f5489ebfe2cdeffd8a8a7ee4d0ef746cdb8edc222601d023d12183
font_01_sfnt_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 10552 bytes
SHA-256: 3348e4839c515b85a4613d94ee4a15d5c19cf2d5a8ec671860bfe2cb10600c23

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