Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f729504b5b1aea…

MALICIOUS

PDF

83.8 KB Created: 2021-03-08 11:34:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 01549c779c12e61c026957585cfc8669 SHA-1: 082bb8f59aac3d1b4893cb167fd102e26aa25835 SHA-256: a5f729504b5b1aeab68d35853f85282b53ade4772dba97befd795265757b0687
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The document contains a large number of external links, suggesting it is part of a link farm or SEO manipulation scheme, likely intended to direct users to malicious content or phishing sites. No scripts were extracted, but the presence of external links and the high detection scores strongly suggest 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/123?utm_term=bluetooth+untuk+laptop+windows+10
    • https://kufaxaza.weebly.com/uploads/1/3/2/6/132680799/gajukawade.pdf
    • http://bupro.asia/fadojamojufawemevupusauoo.pdf
    • https://femuketidoxesi.weebly.com/uploads/1/3/3/9/133997502/8496291.pdf
    • http://nebofimanigi.sportsontheweb.net/asian_stock_market_open_time_est.pdf
    • https://gefawopunov.weebly.com/uploads/1/3/0/9/130969454/zisexuvukexej.pdf
    • https://wutuzorul.weebly.com/uploads/1/3/5/9/135963099/godozujugonumuv-dizetoxafixivid.pdf
    • http://tejasatobes.medianewsonline.com/how_do_i_file_a_complaint_against_a_judge_in_florida.pdf
    • http://prodson.fun/81745789520ffuac.pdf
    • http://sfr-espace.best/tiwalanajag6r45.pdf
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/af74f6a.pdf
    • http://4kuhd.me/agario_private_server_mod350zd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_46ef06662e1049ab871790ea9b7e4341.pdf?index=true
    • https://584dc5e1-4449-4bca-b3d9-d0e1fa08a972.filesusr.com/ugd/185caa_96a843e9015a4b5ab20313caa4d9b7c7.pdf?index=true
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_b25416e20f52497e9e982c8ad02f34af.pdf?index=true
    • https://f803bf1b-e1c2-47f6-a41f-c9785c88fbd4.filesusr.com/ugd/bf07b1_af4fdd0106ea47d38fe7aaf4067166b0.pdf?index=true
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_59956a4cc4bb46f3b4404fce33d52446.pdf?index=true
    • http://tigagatu.atwebpages.com/95818332569.pdf
    • https://0fe83ef2-ed6b-4f04-a52d-31fe3c58d8d1.filesusr.com/ugd/ade4e6_08cf6c546f01483688704f74e73fdcc0.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_off000109a8.bin
945a5dc172cd16a4287e1564195a57acb6696964faeedbd4fb92520a3f8ceafc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 5352 bytes
font_01_sfnt_off00011bec.bin
fd1efcea80614b733e9e5ec2723444c0355c320d9ccb16f169d7f4ded294c6eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BEC 11240 bytes

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