Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecaf95ccdbec0bc3…

MALICIOUS

PDF

84.8 KB Created: 2021-02-18 12:50:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9b9b3cf8b6e9c7794000881e05235fe0 SHA-1: 7e7868836b13d64234d893021f1702460f408052 SHA-256: ecaf95ccdbec0bc30f921477acbbdf1590dba6644f9421783eaa273716cb7f4f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains embedded URLs that point to potentially malicious domains, including one that appears to be a link farm designed for SEO manipulation. The document body, though heavily obfuscated, suggests a lure related to 'instructions', aligning with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=peq+15+instructions PDF link annotation
    • http://digtalcaliper09.xyz/zununajpxlb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_5fd260f4b0719.pdfIn PDF document text
    • http://logmeinnow.xyz/91664680303s4izj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_6027bdb11334f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5ff3e67997f8d.pdfIn PDF document text
    • http://nejesekepub.22web.org/99527630640.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_5fe9da9fc1e52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387586/normal_5ff06f98b8628.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418383/normal_5fed42d37f5d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_60288f57e89fc.pdfIn PDF document text
    • https://cdn.sqhk.co/zaviresodew/SJUgige/mod_pizza_near_me_directions.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387815/normal_5fe34166dc842.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://laganomezavarof.epizy.com/tion_words_list.pdfIn PDF document text
    • http://fikikozazilut.rf.gd/xovamobitujagegisez.pdfIn PDF document text
    • http://dufazovuko.epizy.com/14793228509.pdfIn PDF document text
    • http://fumaresaxebikab.epizy.com/povokejepuk.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_off00010d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D5E 4856 bytes
SHA-256: 95a3750963e1a1591593300ed3570b08e0400bff5458f062deab54ab9c30d57f
font_01_sfnt_off00011e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E07 11520 bytes
SHA-256: ac3bd4b5ac889420240f7d6a2d277a155a7fae7b0df87101d9ac161e2ceebdbd

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