Malicious PDF — malware analysis report

Static analysis result for SHA-256 af7062fd083828c9…

MALICIOUS

PDF

75.3 KB Created: 2021-01-04 06:08:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52979ba6ad11ab2aa1ab5ddfe0027d8a SHA-1: 1decde433a6c9cc5815df374cab5e32d9e862854 SHA-256: af7062fd083828c9bf835cc8b84b7f8b4c57a9b7958c9026c61a7a7a29dee5a5
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to link farms hosted on platforms like Weebly, indicating a phishing or SEO poisoning attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

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://trafffi.ru/123?utm_term=ffxi+smithing+guide+nasomi
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/d96ddb407408.pdf
    • https://nawopudupavipe.weebly.com/uploads/1/3/4/8/134856820/doxokofowefodakobu.pdf
    • https://radunepik.weebly.com/uploads/1/3/4/6/134617153/vewisamidolapas.pdf
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/1da28afeeba5.pdf
    • https://kizujaxaluw.weebly.com/uploads/1/3/4/3/134393650/759070.pdf
    • https://janokapaw.weebly.com/uploads/1/3/4/3/134329878/vemozoteduregepivilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tobobowu/15927615602.pdf
    • https://uploads.strikinglycdn.com/files/7a862b45-57e7-4960-a6c0-d5e6be882512/takarabamoduxuxenezi.pdf
    • https://uploads.strikinglycdn.com/files/51106926-2034-472d-8e13-7f53d66f901e/cupcakes_recipes_vanilla.pdf
    • https://uploads.strikinglycdn.com/files/b66ccd73-2cf5-41cf-89e8-b742069507f0/generador_gemas_clash_royale.pdf
    • https://uploads.strikinglycdn.com/files/4a990131-f581-4ff0-920e-c50d7b6d17c0/3_movie_background_music_remix_ringtone_download.pdf
    • https://uploads.strikinglycdn.com/files/348f0cba-0494-49a3-9bea-faa49cac5da5/kikari.pdf
    • https://s3.amazonaws.com/bezegoluzose/android_version_10_oneplus_6.pdf
    • https://s3.amazonaws.com/sulasatevirexo/class_11_cbse_biology_textbook_free.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_off0000e7b1.bin
b1e510fe5e2a85e5ef9990c1d7b71d64375eb14547097496ad5f0acf42913944
pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B1 5216 bytes
font_01_sfnt_off0000f959.bin
2d53607e20affc7cdcece97c1578ca1b24cd86cfab7b8b7a5121878d047c39cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 11420 bytes