PDF malware analysis — malicious · f31a07132b28c5d5

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 23:29:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: f8d36f59d60fd98789c840ca6c0677ae SHA-1: ba3259e9e32d76f4468a8765107c9aae9ded3505 SHA-256: f31a07132b28c5d5a6df6920bda35669b97165d3cebfb5316d816e08fe0f132f

134 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, indicating a phishing or malicious redirection attempt. The heuristic 'SE_URGENCY_LURE' suggests the document uses urgent language to prompt user interaction. ClamAV detection and ML classification confirm the malicious nature of the PDF, likely serving as a lure for further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://cructi.ru/uplcv?utm_term=how+to+take+a+single+page+from+pdf PDF link annotation
- http://qiuyutv.com/userfiles/files/20210903044913.pdfIn PDF document text
- https://radio-aurea.eu/files/file/mavigiro.pdfIn PDF document text
- https://danielstrehlau.com/userfiles/file/muligisitopuw.pdfIn PDF document text
- https://www.premiumtrade.ro/ckfinder/userfiles/files/nisusatufoj.pdfIn PDF document text
- https://aquarell.ro/userfiles/file/wijew.pdfIn PDF document text
- http://istanbulballoons.com/ckfinder/userfiles/files/57015021308.pdfIn PDF document text
- https://godparents4tz.org/home/god/public_html/ckfinder/userfiles/files/56096668274.pdfIn PDF document text
- http://kondicionery-himki.ru/upload_picture/file/duguwojisobenuxenumujejir.pdfIn PDF document text
- http://grabnerestriche.at/fasigupuvasagojazaba.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/b9fa91aa41aa17ee78b33713c286a8c1/lutebukagagipakewifobovat.pdfIn PDF document text
- http://travelsi.ru/ckfinder/userfiles/files/mizivubufipar.pdfIn PDF document text
- https://rajatotogroup4.com/contents/files/45899413496.pdfIn PDF document text
- https://gallerylingard.com/uploads/file/nuxawapepekekudome.pdfIn PDF document text
- https://matratva.in/userfiles/file/75515758765.pdfIn PDF document text
- https://aedwea.com/upload/foto/gafuratesunekobamepaki.pdfIn PDF document text
- https://bongkartuantakur.com/contents/files/5874155910.pdfIn PDF document text
- https://dienlanhhonganh.com/images/pic/file/83803871258.pdfIn PDF document text
- http://npas.ru/pic/file/foposolukulitepojurizu.pdfIn PDF document text
- http://identik.hu/editor_up/93447103758.pdfIn PDF document text
- https://delta-relay.be/userfiles/file/lewenupipudeti.pdfIn PDF document text
- http://andlupa.com/userfiles/file/larudafopi.pdfIn PDF document text
- http://maremania.net/img_pagine/file/pivamidofemalaxiv.pdfIn PDF document text
- https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/13ff1a68f374e20376455688242d741d/kesawojavubovisubopojin.pdfIn PDF document text
- http://fertilityupdates.com/userfiles/files/buroxurutamuxurisobarofaz.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://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d800.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD800	11008 bytes
SHA-256: `2bf0f0fdb73c6b4b7a79746ca3b18e44321f251f4ce19c39d46c296ab0a11584`
`font_01_sfnt_off0000f15f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF15F	17640 bytes
SHA-256: `26e995fc6d9b5300c5ae4888f1ace486470a74dc845b470a89f5b4b4fe204b14`
`font_02_sfnt_off00011e85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11E85	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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