PDF malware analysis — malicious · b64334cf5484c277

MALICIOUS

PDF

85.2 KB Created: 2021-03-22 03:31:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23

MD5: e094c91642605a82b4e7e6c2fa358de7 SHA-1: 58eef2e6c724690df613d64ad6ab3980dc3a1c65 SHA-256: b64334cf5484c277ca46ab3039a4b34e1b2db98a4f8a39e8576b5d458e8f747c

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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
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.
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://fokemale.ru/award?keyword=neurological+examination+of+newborn+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4372080/normal_601c94db84eb6.pdfIn PDF document text
- https://fabupegux.weebly.com/uploads/1/3/4/6/134689396/d9e0dba42cd5c9.pdfIn PDF document text
- https://pabidiwamudobav.weebly.com/uploads/1/3/5/2/135299897/finipukoguwumoperik.pdfIn PDF document text
- https://serorufadorulu.weebly.com/uploads/1/3/1/4/131483245/2a7e46c.pdfIn PDF document text
- https://kigivalivago.weebly.com/uploads/1/3/4/3/134337689/5297a.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368747/normal_5fe1c07cc8a13.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4386618/normal_601de9b620156.pdfIn PDF document text
- https://mazidumusud.weebly.com/uploads/1/3/4/6/134680178/xabozej-butipapofapinum-lubiz-sidukofoja.pdfIn PDF document text
- https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/9088883.pdfIn PDF document text
- https://sudazevoj.weebly.com/uploads/1/3/1/4/131406082/raziz.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375891/normal_6049214c8bbd9.pdfIn PDF document text
- https://xuxasogunoniku.weebly.com/uploads/1/3/1/8/131856570/radoriputej-relazafusizel.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4378425/normal_601f6ddd37294.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://4bbf79d8-97e4-42de-9a75-948158c354f0.filesusr.com/ugd/52f5d3_194c0bb139f94ee585181d5a30e0e985.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/88c90f6c-18a4-480b-9462-eb9a0408462b/troy_bilt_pony_drive_belt_length.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/2c34040e-0486-4265-a878-9f082fb8b102/15875253811.pdfIn PDF document text
- https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_e8c9aafe328640f2874d59525e92c996.pdf?index=trueIn PDF document text
- https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_84de1a9706284bf39690787428f6cb6f.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/8c2b3604-e363-498a-9ec7-8716cae6912d/zametexenagagulorepami.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_off0001027f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1027F	5448 bytes
SHA-256: `4b41e46b500a3acd5609748fb61d5ee9d1d6e3eb5834b84bae6a7d27441e336d`
`font_01_sfnt_off0001150a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1150A	10616 bytes
SHA-256: `3eabdb2aee4c1ac7927ca6732df0010d0f06f52d73565f43473599e257ed1253`
`font_02_sfnt_off000138f0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138F0	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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