PDF malware analysis — malicious · f6d777e2ef606b81

MALICIOUS

PDF

78.5 KB Created: 2021-05-24 04:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 847b7867bc3488ee9cb5169fd851f20d SHA-1: 62ddaf2692f839df7843ded4b0e135b85262029b SHA-256: f6d777e2ef606b8133b43cc67f024f549d1989c015682400e649b9909c968c86

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting it's part of a link farm designed to redirect users. The primary URL observed is 'https://gimoguvi.ru/strik?utm_term=dk+lok+catalog+pdf', which is likely used to funnel traffic to malicious sites. No scripts were extracted, but the PDF structure and link farm heuristic indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9930

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://gimoguvi.ru/strik?utm_term=dk+lok+catalog+pdf PDF link annotation
- https://cdn-cms.f-static.net/uploads/4495271/normal_5fd60d126556f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4419827/normal_60240b4aac9e0.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427514/normal_5fe98ee343dad.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4495271/normal_6004c108105be.pdfIn PDF document text
- https://puvugopusu.weebly.com/uploads/1/3/2/7/132711965/7665108.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4495841/normal_604b45b8e6e02.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4413851/normal_601c01a025c9b.pdfIn PDF document text
- https://gixunilaw.weebly.com/uploads/1/3/1/8/131856646/7390330.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4383156/normal_5fcca90c513fa.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4468551/normal_5fcc6e691645f.pdfIn PDF document text
- https://vulagikivup.weebly.com/uploads/1/3/4/2/134234906/778710.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4498324/normal_5fc7fa6160f0b.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4410415/normal_5fcc443cb10dd.pdfIn PDF document text
- https://fogurasetaj.weebly.com/uploads/1/3/5/9/135961985/gezepifetarig.pdfIn PDF document text
- https://videxopejevis.weebly.com/uploads/1/3/5/3/135333638/9360427.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4467005/normal_5fd63c78a886f.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4495392/normal_60591a870d4b6.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4420776/normal_600066652af40.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4467278/normal_604654e2a1188.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4420589/normal_6028bf3230648.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://uploads.strikinglycdn.com/files/c2d42c74-bf28-4435-9fea-c143d0bfd112/delta_flight_attendant_pay_rate.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/23b4de43-ac1a-4698-95aa-829941fc9285/linear_algebra_with_applications_ninth_edition.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a7b8f09c-e1c9-4651-94f8-47432231ba4b/mn_drivers_license_test.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/d45a35b7-e1cd-435f-931f-eb95702fbbae/best_push_pull_3_day_split.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/6d15ec09-0fc0-4f71-bf4d-cf70936f2738/basegi.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/64941bd1-8678-45a7-a92f-a5c719aa8d98/kelovijiripefite.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a9b14d9a-6344-4bf4-a7b4-4ac3229c79d0/honda_rebel_for_sale_los_angeles.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
- http://dejavu.sourceforge.netIn PDF document text
- http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d557.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD557	3164 bytes
SHA-256: `ac9cd10ee290e563123b158bb7df9a9ffad6eb4a6044f7fea8a802e85ad8d570`
`font_01_sfnt_off0000e096.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE096	5112 bytes
SHA-256: `9a029a9cf1095b737dc0e1f6abc4517c827ac91f00db674fcd32a451b19984ef`
`font_02_sfnt_off0000f223.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF223	10124 bytes
SHA-256: `00dfcc56e0ed7def7d66c4e34e5d7c39c651ad95db46dbab1135f8317f9c4fb1`
`font_03_sfnt_off00011519.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11519	16204 bytes
SHA-256: `e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15`

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