PDF malware analysis — malicious · 99791699ac13d275

MALICIOUS

PDF

74.2 KB Created: 2021-02-19 21:44:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: b6a32102c63524f9231ea945c1fa4fae SHA-1: 7ee978027bf0eb4f2dc5e318fb8db9472c954e8c SHA-256: 99791699ac13d2758bcdde6a4bc2d441af26d7823f1b564cb8d7df6cdb8397ba

104 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it contains external URIs and uses an invoice/payment lure. The document body, though heavily obfuscated, contains text related to 'donation receipt template' and 'wkhtmltopdf', suggesting a social engineering attempt to trick the user into visiting a malicious URL. No scripts were extracted, but the presence of embedded URLs and the invoice lure strongly suggest a phishing or malware distribution vector.

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
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
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://jacksth.ru/wix?keyword=donation+receipt+template+for+501c3
- https://cdn.sqhk.co/vofonowul/gfC5hjW/laptop_tycoon_sandbox.pdf
- https://cdn.sqhk.co/funuwovo/fjjichf/bombsquad_mod_manager.pdf
- https://cdn-cms.f-static.net/uploads/4367622/normal_60229585e94b5.pdf
- https://cdn.sqhk.co/mumaxifup/gcBhjji/72818623620.pdf
- https://static.s123-cdn-static.com/uploads/4393208/normal_5fe4235e3c277.pdf
- https://cdn-cms.f-static.net/uploads/4455659/normal_601f6d6c7622d.pdf
- https://cdn-cms.f-static.net/uploads/4382965/normal_602b3ae60e02d.pdf
- https://static.s123-cdn-static.com/uploads/4479210/normal_5ffbb29b2b90a.pdf
- https://cdn-cms.f-static.net/uploads/4421787/normal_602e2b03ed103.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://s3.amazonaws.com/kelukakeb/cea_safety_guidelines_2010.pdf
- https://s3.amazonaws.com/lebaxa/47524674429.pdf
- https://s3.amazonaws.com/guxosa/calculus_full_course.pdf
- https://s3.amazonaws.com/vatakefojunib/surefire_cpr_nrp_study_guide.pdf
- https://s3.amazonaws.com/dagasopones/binotezidin.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e32e.bin` `eca1b3859baa41c66f1bc59dd28b49f204edbed3b78cec1cfaa26dd795d148f8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE32E	5464 bytes
`font_01_sfnt_off0000f5c5.bin` `c1f6e030fbfc5ab7c5de772aa6e2b95669831ff7416d6eb98779d629b2093200`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF5C5	11316 bytes

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