Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cd7994364e8d610…

MALICIOUS

PDF

73.9 KB Created: 2021-02-28 17:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: c5d304b0fd3db427856b8fc03932af09 SHA-1: 0e354b37add886a626251b53724ef1278c015fcc SHA-256: 0cd7994364e8d610db6ef849b525a69003daeb42546ce8587d3e84fa8e542ede
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jottigo.ru/123?utm_term=how+to+make+a+outfit+in+royale+high PDF link annotation
    • https://cdn.sqhk.co/raninogozo/Tvv5uhe/83989887953.pdfIn PDF document text
    • http://tapozifokun.mywebcommunity.org/data_science_what_do_i_need_to_know.pdfIn PDF document text
    • https://cdn.sqhk.co/fekesolip/Zv6tEXe/snowball_fight_pc_game_download.pdfIn PDF document text
    • http://zeboxagekej.sportsontheweb.net/nevurezagavoleg.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/8297102.pdfIn PDF document text
    • https://kutawujotin.weebly.com/uploads/1/3/4/0/134016956/c190bd3cd4c.pdfIn PDF document text
    • https://cdn.sqhk.co/vemikozoj/TElXOzt/sapupisiruxesesojumases.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/bc2dc68a52fd7.pdfIn PDF document text
    • http://lavazapunizala.iblogger.org/international_business_degree_description.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/78848389330.pdfIn PDF document text
    • http://desokore.medianewsonline.com/60834300224.pdfIn PDF document text
    • https://lemusovigezamo.weebly.com/uploads/1/3/1/3/131381045/457c7f955a48c.pdfIn PDF document text
    • https://cdn.sqhk.co/disanefamu/ific7ef/wizard101_snow_drift_gear.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/dsgcK5k/toxuwimituvo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vutekumini.epizy.com/us_history_workbook_answers.pdfIn PDF document text
    • http://gukisika.rf.gd/dunodapezedodorureki.pdfIn PDF document text
    • http://kafopazam.epizy.com/vefisi.pdfIn PDF document text
    • http://zifojaxi.rf.gd/heart_of_darkness_part_1_detailed_summary.pdfIn PDF document text
    • http://gixarewujedel.atwebpages.com/76887323385.pdfIn PDF document text
    • http://wokoziguroron.rf.gd/tomigemiberekixunidivaw.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C5 5224 bytes
SHA-256: d034d3b7c399ea8a2f52e5493e22cf37bde89de57f94d70a7e67dcaa6b44e714
font_01_sfnt_off0000f577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF577 10988 bytes
SHA-256: f7baf3d4a6a2eaa6c94661ae665087568f78eacad7690dd4c0400cd40cf87f2d

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