PDF malware analysis — malicious · a72c21c6dc679309

MALICIOUS

PDF

82.2 KB Created: 2021-09-19 15:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: d19bfc926decb05daea7dee2b811900e SHA-1: 781aabb0f30de65129e64f6cac5bbc88da8de35f SHA-256: a72c21c6dc679309c6d55240b3953b81d2b62573cbc25b85616a581fb92a0e8e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1553.004 Security Software Installation

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many hosted on disposable domains, suggests a link farm or phishing infrastructure. Crucially, the heuristic 'SE_SECURITY_BYPASS' indicates the document instructs users to disable security software, a common tactic in phishing and malware delivery to facilitate further compromise.

Machine Learning

Nyx PDF Classifier malicious score 0.9960

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
Security software disable instruction high SE_SECURITY_BYPASS

Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
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://inwebjor.ru/uplcv?utm_term=how+do+you+unlock+a+locked+android+phone PDF link annotation
- https://idd.no/ckfinder/userfiles/files/58673314782.pdfIn PDF document text
- http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8becba3a7---74243786481.pdfIn PDF document text
- http://medicalproduct.hu/images/files/wafew.pdfIn PDF document text
- http://constantemails.com/userfiles/file/163054192996043067139.pdfIn PDF document text
- http://samtekelektrik.com/files/51609471442.pdfIn PDF document text
- https://giridhareye.org/ckfinder/userfiles/files/31857255178.pdfIn PDF document text
- https://www.domosystem.gr/ckfinder/userfiles/files/63888367998.pdfIn PDF document text
- https://hinodanang.com/uploads/image/files/5589955584.pdfIn PDF document text
- http://vattucongtrinh.com/userfiles/file/17463215928.pdfIn PDF document text
- https://searches.onlineconvey.com/userfiles/file/37185996025.pdfIn PDF document text
- https://implant-drill.com/userfiles/file/duburirinezabu.pdfIn PDF document text
- http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16140509ca090e---7918824705.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/migevijajowuj.pdfIn PDF document text
- http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/15775159168.pdfIn PDF document text
- https://detmers-kontejner.hr/files/12733227.pdfIn PDF document text
- https://pushtypathshala.com/demo/aims/files/images/files/wuxolenopo.pdfIn PDF document text
- http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/52944810104.pdfIn PDF document text
- http://www.annaleehuber.com/content_files/file/44120380546.pdfIn PDF document text
- https://ontogepszerviz.hu/editor_up/lidowoxisabofogeralezoge.pdfIn PDF document text
- http://orbitsecurity.qa/pro_mvp_tech/uploads/file/natug.pdfIn PDF document text
- http://gorod-r.com/userfiles/file/44389346896.pdfIn PDF document text
- http://techsystem.gr/data/uploads/ckeditor/files/37574566804.pdfIn PDF document text
- http://namkhoabacninh.com/images/files/65332195564.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_off0000dd88.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD88	17732 bytes
SHA-256: `655d95b6cc6887d44811271c59b5a3178c5fc2e8399ffbb516ec14c0fdd0bdb2`
`font_01_sfnt_off00010aa4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AA4	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000122bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x122BB	10728 bytes
SHA-256: `2a824d8c49afdbb0f7de9b748b15f16dcb64359b4db74679bda72f5d0c5ab694`

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