Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0ff825c0f40993d…

MALICIOUS

PDF

71.1 KB Created: 2021-06-01 01:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 842a5bd0c6b6abeb514a9ab3fb8b7b61 SHA-1: ae0b666ba091c707b00ed98ef948608f38e211c6 SHA-256: e0ff825c0f40993d8a9178c5dd04f997e15feae38e999e85755061c2d5e968db
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, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://lozipotod.ru/123?utm_term=geometry+answers+mcdougal+littell
    • https://cdn-cms.f-static.net/uploads/4380867/normal_602e64eaa9fec.pdf
    • https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/pipotolibizi.pdf
    • https://static.s123-cdn-static.com/uploads/4402933/normal_5fecfd9a01761.pdf
    • https://cdn-cms.f-static.net/uploads/4414864/normal_603b493bcb53d.pdf
    • https://lemapola.weebly.com/uploads/1/3/1/4/131407815/6293c2241fe9445.pdf
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fd9a3b3e9f14.pdf
    • https://tasagimaxo.weebly.com/uploads/1/3/0/8/130813305/1660075.pdf
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/1692404.pdf
    • https://ketodoligas.weebly.com/uploads/1/3/4/3/134384615/xubosoviru.pdf
    • https://faripolugariwel.weebly.com/uploads/1/3/1/4/131453512/fosejezikowilavo.pdf
    • https://welabelodaset.weebly.com/uploads/1/3/5/3/135399274/xufidata_buxebob_bigow.pdf
    • https://cdn-cms.f-static.net/uploads/4495385/normal_6028872d469c4.pdf
    • https://cdn-cms.f-static.net/uploads/4447093/normal_6023f301dbbd0.pdf
    • https://cdn-cms.f-static.net/uploads/4383692/normal_6040e2687cae9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4d961f39-b1c4-4e51-ae6b-72db5ec531c5/32857210480.pdf
    • https://uploads.strikinglycdn.com/files/3c6f6db3-c39c-43e5-a1ba-cd3236b6acae/powupopen.pdf
    • https://uploads.strikinglycdn.com/files/a6c753b2-e90f-4edc-b9d2-adc7512b081a/how_to_improve_your_english_speaking.pdf
    • https://uploads.strikinglycdn.com/files/fae3627c-0b0b-4c03-9e86-a05fb3201a91/bizomasixapibovipasoti.pdf
    • https://uploads.strikinglycdn.com/files/d6f79018-9e5f-4222-853c-cbe14bf60b6c/guitar_lesson_open_g.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d82a.bin
612cdd9747f5436d29e44f7a207ee0cc92327a2cf3774f3a2ce6b6d74b7e2570		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 5484 bytes
font_01_sfnt_off0000ead1.bin
11872fc1a1d493abe99f980bd08aad602f104631b17e4edd5e535ec2817ba09a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD1 10848 bytes

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