Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4e61d8419ac864a…

MALICIOUS

PDF

69.5 KB Created: 2020-12-17 00:03:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a935784c44a744a37a157ab93e484044 SHA-1: d21fd6fabf8e2a4fc45ab41d83cf539e336b3a33 SHA-256: b4e61d8419ac864a89735445ae6ecce132ba4afe1662d59c5233ab801edc1f47
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of these links, 'https://traffset.ru/123?utm_term=assy+mcgee+episodes', is flagged as suspicious. The presence of numerous external links suggests an attempt to redirect users to potentially malicious or deceptive content, aligning with phishing or SEO spam tactics. While no scripts were explicitly extracted, the PDF structure and link farm behavior indicate a malicious intent.

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://traffset.ru/123?utm_term=assy+mcgee+episodes
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/648114.pdf
    • https://cdn-cms.f-static.net/uploads/4369775/normal_5fda83a47edc2.pdf
    • https://cdn-cms.f-static.net/uploads/4411932/normal_5fd942116bf4d.pdf
    • https://dizegeduwawab.weebly.com/uploads/1/3/4/3/134374994/5917885.pdf
    • https://rojumiladikeju.weebly.com/uploads/1/3/4/3/134315163/9193891.pdf
    • https://jirunemopisitex.weebly.com/uploads/1/3/4/3/134332051/tuboloduzele.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0d6b1edc-7574-467f-895f-d0fd9b042a35/33357574197.pdf
    • https://s3.amazonaws.com/sefipa/29425035995.pdf
    • https://s3.amazonaws.com/dukajevo/26874339728.pdf
    • https://s3.amazonaws.com/juvosi/arsenal_kit_dream_league_soccer_2019.pdf
    • https://uploads.strikinglycdn.com/files/ded8594b-364c-418a-9a37-c6771ee2e335/do_any_sperm_enter_the_pelvic_cavity.pdf
    • https://s3.amazonaws.com/xomepixo/91_mustang_auto_to_manual_swap.pdf
    • https://uploads.strikinglycdn.com/files/0b783136-8644-484c-b7a0-63767fd54eb5/84034979195.pdf
    • https://uploads.strikinglycdn.com/files/a4cbf58a-4e68-4714-b32a-c338ec3c5a2d/work_and_power_math_problems_answers.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c814.bin
8464e6e7d255fb532cfc5bb72f176ae9207f1b196f68557864e2c0b2e3f1af8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC814 3232 bytes
font_01_sfnt_off0000d37a.bin
76506404f84a1a44f7847612c5dfb0fffe46bf27144d57e0bae43caa4a43bce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD37A 5144 bytes
font_02_sfnt_off0000e4fe.bin
b4884cdad1fcbda64e2b6a48f4022fc10d6f53943cbd10e0695bf2264fe4f084		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FE 10960 bytes

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