PDF malware analysis — malicious · f99ef8c82422540a

MALICIOUS

PDF

88.0 KB Created: 2021-03-20 23:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07

MD5: 8d07572f81f5232ef30941ce458f9c69 SHA-1: 4db1d28ec0fd87d05d755c209ea0c0c6f6cc2e5f SHA-256: f99ef8c82422540a7788af62bacbefdb2fef26e599ed7cd3a228d2b5ef4efec1

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, as malicious. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain (`soxebez.ru`) that is likely used for phishing or malware distribution. The document's structure and embedded links suggest it is part of a link farm designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9991

Heuristics 5

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.
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://soxebez.ru/award?keyword=calculus+with+analytic+geometry+book+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4458824/normal_5ff8844684e67.pdfIn PDF document text
- http://toolsbestpricemicrometer.site/xbox_360_wireless_controller_pc_softwarech3cv.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4366980/normal_6019d9758bda1.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4474478/normal_6037be3ac9de7.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4459926/normal_5fcebafc379c3.pdfIn PDF document text
- http://proba7.xyz/55952322549ckdp5.pdfIn PDF document text
- http://qiwi-wallet.online/67774017038yrq4m.pdfIn PDF document text
- http://digitalcalakk1.xyz/42279077985nqh7x.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4421764/normal_5fe4c1327b148.pdfIn PDF document text
- http://salukapebuke.iblogger.org/rogise.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4421354/normal_60137bb2cd17a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4418180/normal_5fd036279a9a4.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://31e64076-56b3-4e53-9780-179364fbad2f.filesusr.com/ugd/d8d3cb_c961462240044704936506d88d3d95c5.pdf?index=trueIn PDF document text
- http://jusumexavajuzin.epizy.com/xutumegujuganitu.pdfIn PDF document text
- http://jasumubi.rf.gd/11710867401.pdfIn PDF document text
- https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_80e498332cab41ddb1648bd4d5ca5dbf.pdf?index=trueIn PDF document text
- http://mojebevusawibo.rf.gd/arduino_mega_2560_r3_manual.pdfIn PDF document text
- http://dimelezojexuz.rf.gd/68863133460.pdfIn PDF document text
- https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_cd79169f76dd45cf9323ca2ec3985db6.pdf?index=trueIn PDF document text
- https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_80bc9f22f560420097f8f0c4f9fe0722.pdf?index=trueIn PDF document text
- https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_cae3cb06c57f4832a236b6545e0255df.pdf?index=trueIn PDF document text
- https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_501e33678fb042f2b20bdcab05d0ba4a.pdf?index=trueIn PDF document text
- https://146c8b6c-0b46-450b-8ed0-b45f1e2a4974.filesusr.com/ugd/b58d21_4f53b147e164463194eb992c8401030b.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e44c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE44C	16860 bytes
SHA-256: `cfe73d493cd0a2939a99c8e6b68aa557968a6d63f2fe2faac64b15c4a9fc3f70`
`font_01_sfnt_off000119f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x119F5	5872 bytes
SHA-256: `20bff2051cac9d4dc75352d449eba4c0ef2f408e606d43eb1569bc275375efa3`
`font_02_sfnt_off00012dd5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12DD5	10548 bytes
SHA-256: `2773b7d2f70b96af44647b3018f0289746dfea491b98bf20579c41ae0733a12c`

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