Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2251b3c2c6441b…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 21:15:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e534b09f550bc7686f72d7bef12363a SHA-1: 6ca04629bc7fd98d2f2f5a2f8edd4da6d3bab2d8 SHA-256: 4a2251b3c2c6441be318708d0c5e2fc4a11af2ac1aa3b625d9ef34bbff6451be
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with the primary URL pointing to a domain associated with a link farm. ClamAV and ML classifiers flagged this as a phishing or malicious PDF. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to potentially harmful content.

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/award?keyword=utility+software+notes+pdf
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/7183785.pdf
    • http://jisetatiloro.scienceontheweb.net/lujon.pdf
    • https://static.s123-cdn-static.com/uploads/4379982/normal_5ff9676bba4a5.pdf
    • https://cdn-cms.f-static.net/uploads/4451932/normal_6025175330b6b.pdf
    • https://bibevugu.weebly.com/uploads/1/3/1/4/131406802/ruletepanuxowu.pdf
    • https://vowagogo.weebly.com/uploads/1/3/5/3/135307183/lupuzesipavuzukimor.pdf
    • https://riwurarelix.weebly.com/uploads/1/3/4/4/134484082/vujaradodanop.pdf
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/9244f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_1770c699db1e411487ae0cedbacde409.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d6f64fee-1681-4f3d-8082-121050086997/57850349597.pdf
    • https://uploads.strikinglycdn.com/files/ab42a6c4-9138-43e7-b4ed-b61d0e8b6173/8638433747.pdf
    • https://uploads.strikinglycdn.com/files/710782c9-4920-47a8-b40f-7873b2bd383b/are_troy_bilt_tillers_made_in_usa.pdf
    • https://cd70d4e5-4a1a-4071-96d1-f2415ea5ece1.filesusr.com/ugd/7f46b5_d8af15a3e0494c68a2611b3ca41275bb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5c196c6a-68b3-46d8-be80-48cc64cc6e1f/coding_interview_questions_narasimha_karumanchi_download.pdf
    • https://uploads.strikinglycdn.com/files/9e41b21a-a1eb-4c77-a858-4ff23c2bab64/sky_remote_tv_codes_panasonic_plasma.pdf
    • http://muluwokixo.onlinewebshop.net/what_do_repeating_numbers_mean_spiritually.pdf
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_67f4db65a5ef48969c57ba9c08d43c47.pdf?index=true
    • https://45ae50e1-98a8-4501-9ad6-fc0df438eb43.filesusr.com/ugd/b16523_af08016562f6447ba7b8192524fd3511.pdf?index=true
    • 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_off0000ec7b.bin
787e7c1bb6114530ecbd052b6924cdad5af0d9f5e0b2ffbe67aba8bd2d429733		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7B 5220 bytes
font_01_sfnt_off0000fe6c.bin
9dc4c109b37ea5e3b7fd9f4b7291f23b0202e91fbff7ddb2c7e7fb8d02732a6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 10760 bytes

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