Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c8dff00dd7f8fd5…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 23:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e5e3ff93f1e45119bd48d85a0a48cb8e SHA-1: db13c8ccf494769f6a01848ce573e3ba5ae506a0 SHA-256: 2c8dff00dd7f8fd57dc78856655afbd08d2d93fb2fc3b0fab5747b5ef17f2008
184 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, specifically `https://yafferge.ru/strik?utm_term=transmission+fluid+honda+civic+2017`. The document body, though heavily obfuscated, suggests a lure related to 'Transmission fluid honda civic 2017'. The presence of numerous disposable hosting links and a high ML classifier score further indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=transmission+fluid+honda+civic+2017 In PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/ig5q4jc/88613255285.pdfIn PDF document text
    • https://jajijonag.weebly.com/uploads/1/3/4/7/134762104/rogelonaxikum.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/9a4d537713.pdfIn PDF document text
    • http://rexevivejegox.scienceontheweb.net/what_does_snake_bites_mean_in_a_dream.pdfIn PDF document text
    • https://warapado.weebly.com/uploads/1/3/1/4/131437563/709f8a10.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/476322.pdfIn PDF document text
    • http://jitokinut.iblogger.org/manual_do_proprietrio_citroen_c3_2004.pdfIn PDF document text
    • http://tuxodoj.22web.org/accidentally_in_love_book.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagutaxu.rf.gd/fibe_tv_channel_guide.pdfIn PDF document text
    • http://wutejaxevewef.myartsonline.com/52075068294.pdfIn PDF document text
    • http://livirava.atwebpages.com/30880317597.pdfIn PDF document text
    • http://zulexesovo.epizy.com/powerpoint_templates_microsoft_2007_free.pdfIn PDF document text
    • http://titugol.atwebpages.com/is_witcher_season_2_coming.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_off0000ded2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED2 5676 bytes
SHA-256: 1a6b039ce48ba53545ac88d120b4ad184a5014155c809da6a491b45944dfd4b8
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 10432 bytes
SHA-256: d8d86a34f8b0b4d56f51083f06901cee50cf84de9e1c949580a3b33e52a7dc27