Malicious PDF — malware analysis report

Static analysis result for SHA-256 9471fa3442a197ef…

MALICIOUS

PDF

81.1 KB Created: 2021-03-14 13:53:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6bb7c0e6fddde3fec80413eee4997f34 SHA-1: 2ee30a388c0bec5629319f9798d320403b5c7b86 SHA-256: 9471fa3442a197ef716215badc6ac098d8c0678c2434c090f014eae5b20a4b23
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The presence of 'utm_term' parameters suggests a phishing or tracking intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent, likely related to phishing or malware delivery.

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://jumiwimov.ru/strik?utm_term=sony+str+dn850+subwoofer+connection
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/14ad2.pdf
    • http://bio-ita.fun/53414474667iqlrc.pdf
    • https://sozivaxuzafuzi.weebly.com/uploads/1/3/1/8/131856435/dovilomuviziz.pdf
    • http://kogutojoveso.mywebcommunity.org/vubamarixaxu.pdf
    • https://cdn-cms.f-static.net/uploads/4376606/normal_60175d8e0f4d9.pdf
    • http://ziwegiwe.iblogger.org/mawodivofitirinulokiz.pdf
    • https://static.s123-cdn-static.com/uploads/4419846/normal_5ffbf720f266b.pdf
    • http://josebixotarez.22web.org/luxegufako.pdf
    • http://kittyplay.online/390797868165yghz.pdf
    • https://cdn-cms.f-static.net/uploads/4381321/normal_601d2771e45c0.pdf
    • https://kigumafu.weebly.com/uploads/1/3/4/1/134131380/2b1f34e4c08c.pdf
    • http://nowanedilado.22web.org/c_function_pointer_to_template_function.pdf
    • http://xojuxegalixiluj.66ghz.com/rifapajukob.pdf
    • http://pilevisuzo.iblogger.org/rajuginojulilafusodavelon.pdf
    • http://xodoruzix.iblogger.org/2004_yfz_450_repair_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://damoserik.epizy.com/begifeduxelezudefe.pdf
    • http://zevesijuduma.atwebpages.com/15485058185.pdf
    • http://wokikeka.epizy.com/cuisinart_dcc-3200p1_perfectemp_coffee_maker_review.pdf
    • http://sopexalibip.onlinewebshop.net/les_cours_d_anglais_bac.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_off0000fd72.bin
e31c4c5167f3838d03941f89a69a94b3a515dc6a95c2447deedc6a0ccea7b473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD72 5668 bytes
font_01_sfnt_off000110f1.bin
f5bbf56c213eb4258a5b7294868f2c9289f0842830466bb74e1ad5d76f9b2186		 pdf-font-stream PDF embedded font (sfnt) at offset 0x110F1 11212 bytes

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