PDF malware analysis — malicious · 8bf3eb1191d768f5

MALICIOUS

PDF

86.2 KB Created: 2021-03-01 01:00:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22

MD5: b5bd827f796ee2d8b96334f791945aca SHA-1: b73a75cec464f3ddaec2adcc80fd0c8ad5e5594d SHA-256: 8bf3eb1191d768f59482b9c04c0b1ddc0afd1fb4d5f669b0c9a9db0dcbed68ec

206 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URLs, many of which are hosted on disposable domains, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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://seumenha.ru/123?utm_term=debug+privilege+to+user+in+oracle PDF link annotation
- https://zexotanus.weebly.com/uploads/1/3/0/8/130873712/luvakiwatodekesapafe.pdfIn PDF document text
- https://cdn.sqhk.co/zuronenom/72gd4Mc/tuner_metronome_online.pdfIn PDF document text
- https://mitesevutij.weebly.com/uploads/1/3/4/7/134717039/4839546.pdfIn PDF document text
- https://zobilajes.weebly.com/uploads/1/3/2/6/132682335/kudeduzozopet.pdfIn PDF document text
- https://cdn.sqhk.co/jarogofef/aUygjgj/sulexasevasukekiwibunoz.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4467589/normal_603839fb634be.pdfIn PDF document text
- http://wozupabalaviv.medianewsonline.com/53436344267.pdfIn PDF document text
- https://mumetimobenuja.weebly.com/uploads/1/3/2/3/132302956/gaxeturiwezobu_xapinata_dixewezu.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4382421/normal_5fcea9d1ddc98.pdfIn PDF document text
- https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/b1708e.pdfIn PDF document text
- http://fovikoxesaweziz.medianewsonline.com/maths_book_class_7.pdfIn PDF document text
- https://cdn.sqhk.co/sewizefaxiki/jjfjVV3/xegavisalavezag.pdfIn PDF document text
- http://kogutojoveso.mywebcommunity.org/dir-890l_default_password.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4405202/normal_5fe813f8b5019.pdfIn PDF document text
- https://cdn.sqhk.co/xawodoze/ghBk5gf/84098975636.pdfIn PDF document text
- https://cdn.sqhk.co/tononapiwaso/cgfpiiL/166174203.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://kakasis.onlinewebshop.net/what_kind_of_jobs_can_mechanical_engineers_do.pdfIn PDF document text
- http://pefimubis.myartsonline.com/zilajuvuwitugumobewi.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://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_off000105f3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105F3	3096 bytes
SHA-256: `99cae8871d125eb5674680092d1e069b8eead8fe737480cf828eb9be4ae1997a`
`font_01_sfnt_off00011104.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11104	5300 bytes
SHA-256: `1c2c335f0ffcee8380fd507e47a3258c3940fb37ab3c602e80462e42a5331d8d`
`font_02_sfnt_off00012325.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12325	11596 bytes
SHA-256: `d2e0525a52305a3ef1be2dbfdfe62ca1829a7230cc64aa0b6dae0b03a922f698`

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