Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f828cc4832c5c25…

MALICIOUS

PDF

69.5 KB Created: 2021-01-06 02:30:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30810ddda04b33f5281b74fcc7fd05d7 SHA-1: 7f9fe22360c65f1701ba6251025b81ab7a96615c SHA-256: 4f828cc4832c5c25fad426a9276c4f8e83f23bd5a12562d52c387638b8ab16b7
186 Risk Score

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, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of URLs like 'https://traffking.ru/aws?utm_term=baldi%2527+s+basics+online+free' indicates a possible phishing or scam lure, attempting to exploit user interest in topics like 'Baldi's Basics'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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 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://traffking.ru/aws?utm_term=baldi%2527+s+basics+online+free
    • https://subijiderekura.weebly.com/uploads/1/3/4/6/134616270/9760055.pdf
    • https://static.s123-cdn-static.com/uploads/4367947/normal_5ff312d7d6248.pdf
    • https://nakenofol.weebly.com/uploads/1/3/0/8/130814118/xivabepivizaparoj.pdf
    • https://latesadujogoxov.weebly.com/uploads/1/3/1/6/131607544/xelapajo.pdf
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/zunoraxamugon_darebolugasi_togew_nivitevexat.pdf
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5fc3846d5487c.pdf
    • https://static.s123-cdn-static.com/uploads/4451561/normal_5fdf0078538af.pdf
    • https://cdn.sqhk.co/nebafaveju/cghpxjM/xogoloxajuwoku.pdf
    • https://tajuzoliv.weebly.com/uploads/1/3/4/3/134359899/xeloraxipuseguv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f8f18a57-764d-4904-a346-c9550fb3c102/61125741461.pdf
    • https://uploads.strikinglycdn.com/files/637a7fb9-e582-4c4e-b4dc-32846bcb535b/tulubiwojowunepukudome.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ce.bin
3c0f7722868a83d9b8120fc2dd8fce7bdb76c9ff89693833b0b82ee933f4b052		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 5236 bytes
font_01_sfnt_off0000e6af.bin
12e919497de95db7a519bfb69705a0ab816f25a26e838abce283a278b71cb89d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 10296 bytes

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