Malicious PDF — malware analysis report

Static analysis result for SHA-256 88b70e212c63a683…

MALICIOUS

PDF

80.4 KB Created: 2021-02-28 03:48:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: fe94f2e488964e6c3c8c799f19bcde49 SHA-1: 755f9a05821e7c2496f1a1328451f1ba94808830 SHA-256: 88b70e212c63a683c8a59b2ead22226e4d4e6fd0ab8ddecfd1fbdcd6d83fc397
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. One prominent URL, https://mezovuduw.ru/strik?utm_term=motorola+ht1250+ls+programming+software, indicates a lure related to specific software, likely to facilitate phishing or malware delivery. No scripts were extracted, but the PDF structure and extensive link farm point towards a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://mezovuduw.ru/strik?utm_term=motorola+ht1250+ls+programming+software PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368227/normal_60154b55834eb.pdfIn PDF document text
    • https://motaxajofepox.weebly.com/uploads/1/3/1/3/131381237/6111299.pdfIn PDF document text
    • https://verakolor.weebly.com/uploads/1/3/1/3/131379730/3122083.pdfIn PDF document text
    • http://coins24h.com/is_big_little_lies_available_on_hbo_on_demandtmcbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428061/normal_602af3f554442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372354/normal_5fe5757448a10.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385848/normal_5ffb958b6728d.pdfIn PDF document text
    • https://gomafaned.weebly.com/uploads/1/3/5/2/135296522/19043bb.pdfIn PDF document text
    • https://vepidatebodosa.weebly.com/uploads/1/3/0/8/130874400/f3e643d26.pdfIn PDF document text
    • https://xikobidena.weebly.com/uploads/1/3/6/0/136097244/b2f9e5f01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kilisajafe.rf.gd/medoraliwa.pdfIn PDF document text
    • http://katezoluvezile.epizy.com/archangel_s_heart_espaol.pdfIn PDF document text
    • http://nofugodevi.rf.gd/wodilitisuwugafinolu.pdfIn PDF document text
    • http://wafogaz.rf.gd/nezukadafujiboxigedoki.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_off0000fb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3C 5864 bytes
SHA-256: bb505e21f5606cb6bcb280d5792cdc63d7be43e19ff7f5d4da7cb6e65c6d9bf6
font_01_sfnt_off00010f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F26 11036 bytes
SHA-256: 64864c3f57d28bce1f20d61c14e7c0a9fe06676ad5027ae06b1a40308d5a7168

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