Malicious PDF — malware analysis report

Static analysis result for SHA-256 42d62c01cb79644c…

MALICIOUS

PDF

68.6 KB Created: 2020-12-23 09:33:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76df37ac82491b4e7677c51d174b0b42 SHA-1: 79e282b4db600c1652509c308ee23f342ba85704 SHA-256: 42d62c01cb79644c761625564e574b33935a007626835bc2bd447a5e3fbabacf
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by multiple heuristics and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards an attempt to exploit users through deceptive content, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://traffnew.ru/aws?utm_term=wrist+drop+exercises+pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/taxuzedivekamuxedida.pdf
    • https://vemosigexirapi.weebly.com/uploads/1/3/4/3/134387812/344dddd0b2a64.pdf
    • https://static.s123-cdn-static.com/uploads/4377388/normal_5fdfc597408c2.pdf
    • https://cdn-cms.f-static.net/uploads/4409114/normal_5fb5d9f3e98dd.pdf
    • https://cdn-cms.f-static.net/uploads/4385635/normal_5f9ad44323614.pdf
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/bexegusawox.pdf
    • https://cdn-cms.f-static.net/uploads/4370302/normal_5fad4bea5a7cf.pdf
    • https://gefaturulabi.weebly.com/uploads/1/3/4/4/134487578/6722744.pdf
    • https://nibuwoxemunovox.weebly.com/uploads/1/3/4/7/134714338/razipotaresaxe.pdf
    • https://sisaseno.weebly.com/uploads/1/3/0/7/130776680/sidozuxitimubewo.pdf
    • https://kizilezena.weebly.com/uploads/1/3/4/3/134354573/2139082.pdf
    • https://static.s123-cdn-static.com/uploads/4448357/normal_5fdd414864007.pdf
    • https://karivimefoga.weebly.com/uploads/1/3/4/3/134311068/sutejulije-sovaruxosewof-rigabigipam-jalefunoturit.pdf
    • https://static.s123-cdn-static.com/uploads/4476427/normal_5fcf616a3c0c9.pdf
    • https://volexerakonoza.weebly.com/uploads/1/3/4/7/134713377/vadaridoboki-gizinodop-zuxalovujetudo-xovafoburebiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d011.bin
187b106baf1fc90948f4baca9c16f162cd32e8e7dd924ee29132107d59881a10		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD011 4988 bytes
font_01_sfnt_off0000e130.bin
f184b88a6bb295673d78e1e3eed804b81dff506833de5973681885b02c4333bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE130 11024 bytes

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