Malicious PDF — malware analysis report

Static analysis result for SHA-256 df49edca2bad3a46…

MALICIOUS

PDF

73.2 KB Created: 2021-02-21 12:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 3b380f5f9fdec80893fb122ebf6367a1 SHA-1: b3e0e1656127f49433428794601114abeacfbf50 SHA-256: df49edca2bad3a4699a724cd21df2dc1c03b2c611f310e5243056607fd9ad15c
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The PDF contains an embedded URI and an SEO redirector link pointing to 'https://leonvi.ru/strik?utm_term=toro+recycler+20334+reviews', which is likely used to redirect the user to a malicious website for phishing or malware distribution. No scripts were extracted, but the overall structure and the presence of a redirector strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://leonvi.ru/strik?utm_term=toro+recycler+20334+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365607/normal_6010da7ddad53.pdfIn PDF document text
    • https://cdn.sqhk.co/jojikoxazew/r4ia3gi/65810955809.pdfIn PDF document text
    • http://vinamituloj.22web.org/80568012286.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458849/normal_5fc5f44a3e7bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490001/normal_5fd5fa6c7c4b2.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/fggyggB/wink_smart_home_uk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403938/normal_5fe632e821f3d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lofidofo.epizy.com/a_breath_of_snow_and_ashes_chapter_16.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/31658448864.pdfIn PDF document text
    • http://liwumulexajuvi.epizy.com/dafus.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/happy_birthday_song_video_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/1708973026.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/autosketch_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/dorozowebalilagararux.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/xolanuxo.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_off0000df09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF09 5312 bytes
SHA-256: 785213ab6ccac717f4b5fdf708b2b2f4b8b0d00f4925d2875b1cda580f5919aa
font_01_sfnt_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 11004 bytes
SHA-256: 5510be11973cdcedb4ab843dfbefe3760c0879f43161ff022fb8156557e4450c

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