Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ad9fc01fabbcdcb…

MALICIOUS

PDF

72.2 KB Created: 2021-02-22 22:39:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c98e88887d425b1ade39eeabcfea55c9 SHA-1: 925c6f5e092ad55720d1538c05160eb9870cbea9 SHA-256: 8ad9fc01fabbcdcb107c8d9928016a3f96446f99efccb419dd59110a76133f13
192 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=windy+and+warm+chet+atkins+lesson In PDF document text
    • http://xevimajitufom.iblogger.org/65286892050.pdfIn PDF document text
    • http://wordwild-store.com/liwugigesifr29u.pdfIn PDF document text
    • http://bio-ita.fun/98764904374lh70z.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/51LIAhf/crazy_zombie_9_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/b3hayno/9349168381.pdfIn PDF document text
    • http://organic-ita.space/lofagumetogetnwlky.pdfIn PDF document text
    • http://daliadiago.com/best_gravity_blanket_reviews79ype.pdfIn PDF document text
    • https://cdn.sqhk.co/zarudaletok/jbjhjfP/85114100373.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wedagavuvux.epizy.com/86554122453.pdfIn PDF document text
    • http://pitikepaz.epizy.com/philharmonik_vst_plugin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE4 5236 bytes
SHA-256: 25e7b2c4ec0e7b6bae90871f60d6208b8f1ab84039abab3b01410a4a84e332ea
font_01_sfnt_off0000df90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF90 11104 bytes
SHA-256: 4ec1131fe9c62900bc16f2b919629207d39ddfccd7c36dd9f3b9415f336f8e6b
font_02_sfnt_off0001059a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059A 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34