PDF malware analysis — malicious · 9bae07010f283b79

MALICIOUS

PDF

90.2 KB Created: 2021-05-24 01:08:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27

MD5: fc36b6eaefb7b3d42db5ae1ebb739e5a SHA-1: 0bfaf8e016fdfb50ee800011407a499105701e44 SHA-256: 9bae07010f283b79afd970f96b0c4b99ec4cf12a7de3f7279e0b5c09eab23d11

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to disposable hosting services and utilize UTM parameters, indicating a link farm or SEO spam campaign. The primary URL, https://mezovuduw.ru/strik, is likely used to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as a phishing or trojan-related PDF.

Machine Learning

Nyx PDF Classifier malicious score 0.9985

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://mezovuduw.ru/strik?utm_term=how+much+should+i+invest+in+tqm+capsim PDF link annotation
- https://static.s123-cdn-static.com/uploads/4403946/normal_6005906386b23.pdfIn PDF document text
- https://juxapokidopelif.weebly.com/uploads/1/3/1/6/131606881/jivoda.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4446273/normal_605fe3ecd8753.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4413735/normal_5ff64ee7b0017.pdfIn PDF document text
- https://gijufonuvaxi.weebly.com/uploads/1/3/4/8/134874477/8176f48d51.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4368221/normal_60418a1c476b6.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4427523/normal_605d81d86bd33.pdfIn PDF document text
- https://lukogazusewof.weebly.com/uploads/1/3/4/6/134643336/bf8eba75a0.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4491436/normal_5fe1c1200cb1d.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4373987/normal_604dc239d54ea.pdfIn PDF document text
- https://wakukorukizine.weebly.com/uploads/1/3/2/7/132712206/4247963.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4469355/normal_602551cf8075d.pdfIn PDF document text
- https://fifabazu.weebly.com/uploads/1/3/4/7/134702458/d0e53d2750ad.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4416495/normal_60039bad5f890.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4491705/normal_6036012e651d2.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4443371/normal_602df395b74c3.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4403557/normal_5fe8373f77c83.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4465905/normal_6058b0fa838bc.pdfIn PDF document text
- https://gufekesunix.weebly.com/uploads/1/3/4/8/134888283/f57207cadb062e.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://s3.amazonaws.com/pokorevalaxex/school_things_worksheet_british_council.pdfIn PDF document text
- https://s3.amazonaws.com/metubevozisul/aa_meetings_near_my_current_location.pdfIn PDF document text
- https://s3.amazonaws.com/zemunomipazikez/accident_reporting_at_work.pdfIn PDF document text
- https://s3.amazonaws.com/jovekus/lajadomatu.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_off0000fbb5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBB5	5340 bytes
SHA-256: `b8bb307519bedd74e48bb53096ef6b42c54f8a91d308439cdbd1fec2f831aa2f`
`font_01_sfnt_off00010dc9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10DC9	11708 bytes
SHA-256: `a1885b46395ed261d662ba9db3d9b615cf922433dbc461c6836e9c7bc0ebdf49`
`font_02_sfnt_off000135c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x135C9	16124 bytes
SHA-256: `caa6317b547130858bc60977a25f0268b44449c62f9bfd130eb50f200d782f5f`
`font_03_sfnt_off00014ab3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14AB3	4324 bytes
SHA-256: `4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3`

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