Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d72fd1d751381b0…

MALICIOUS

PDF

80.8 KB Created: 2021-02-06 23:58:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 652996b6ca6eb95ee8058dba19d2964b SHA-1: de610a0d44805b6befb6aeaa5646fb851c2aacff SHA-256: 8d72fd1d751381b0d4d7eb6eab29ee47e53ed7fd391a70116bd2e437e269dd31
224 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a fake CAPTCHA heuristic, indicating an attempt to deceive the user into interacting with the document. It also features numerous links to disposable hosting, with one critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/123?utm_term=mn+dnr+lake+finder+mille+lacs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_60171d659c612.pdfIn PDF document text
    • https://degujipimisa.weebly.com/uploads/1/3/1/4/131453395/8833782.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388173/normal_5ff80d5d2b763.pdfIn PDF document text
    • http://theandyhong.com/hydraulic_jump_calculations_excelcy9mx.pdfIn PDF document text
    • https://fomimelagesuto.weebly.com/uploads/1/3/1/4/131406840/418e717.pdfIn PDF document text
    • http://winoraama.fun/beekeeping_free_download2rs3p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458623/normal_5fd78b1591068.pdfIn PDF document text
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/pisulogobotagapusubo.pdfIn PDF document text
    • https://detubutil.weebly.com/uploads/1/3/5/3/135348338/225348.pdfIn PDF document text
    • http://sellamorem.com/25757156454z7mcm.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/jbFgchd/jamemelerafu.pdfIn PDF document text
    • http://cmbespaceclient.xyz/tinkle_tonic_cats9lx67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 5236 bytes
SHA-256: f75cad71ec693db81fb505e63b1a2d5b6acee75d95e12cbe5bb5b650802309b7
font_01_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 11440 bytes
SHA-256: 810a666b477d02bb9c3468d56e385d11132e95c1e0556ffded754e656b6131ec

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