PDF malware analysis — malicious · 5f4bbebc669b0654

MALICIOUS

PDF

80.9 KB Created: 2021-05-12 22:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 062aaf882e3444122170e1b8fb077202 SHA-1: abf0c3a0835c63a9563551d613c8ba7e0540e118 SHA-256: 5f4bbebc669b0654e7ebd369d7c32e06aabb5d61e6d6d344a5240cddfcdb495b

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier as malicious. It contains numerous external links, including one to `golowaki.ru`, suggesting it is designed to redirect users to potentially harmful websites. The ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

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://golowaki.ru/strik?utm_term=weber+smokey+mountain+beef+brisket+recipe PDF link annotation
- http://nulatapukedu.scienceontheweb.net/ketogenic_diet_download.pdfIn PDF document text
- http://ralugugifoxatir.scienceontheweb.net/union_budget_2020_highlights_upsc.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://6363ce23-9394-4102-a476-7be320345719.filesusr.com/ugd/7c41c1_5a7b7ec66e214506ab4790d9993a965c.pdf?index=trueIn PDF document text
- https://168d2a81-f750-40c6-a653-3787650f980d.filesusr.com/ugd/3bcfef_bf28fd702e4c4234936d2bd59d7a8c32.pdf?index=trueIn PDF document text
- https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_cdbf72016467429b90eb102afadb0973.pdf?index=trueIn PDF document text
- http://lobopekogolo.onlinewebshop.net/2019_toyota_camry_xse_v6_engine_specs.pdfIn PDF document text
- https://s3.amazonaws.com/piradi/samsung_top_load_washer_and_gas_dryer_set.pdfIn PDF document text
- http://jorasixu.myartsonline.com/cabanagem_em.pdfIn PDF document text
- http://mirivukavezigo.epizy.com/whatsapp_free_pc_windows_8.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e5e83ca7-3c0b-49cc-8974-140d995a0fe1/is_resistance_band_training_effective_reddit.pdfIn PDF document text
- https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_46780e823bc34a34a854e4b61fefb2c5.pdf?index=trueIn PDF document text
- https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_ff356021a8da4476b9e03fe7287e0b7d.pdf?index=trueIn PDF document text
- http://sezajuvijib.rf.gd/88881272485.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/99506e01-0189-46fe-97ab-b6fdd2b3bfd0/jexumuxuxivalerumi.pdfIn PDF document text
- https://s3.amazonaws.com/nafamaragisek/how_to_reset_my_yale_lock.pdfIn PDF document text
- https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_d84fed51744f425eb72796e3efc9c738.pdf?index=trueIn PDF document text
- https://uploads.strikinglycdn.com/files/949501ab-909d-4b04-a36e-422a067c54ad/gozemaditilugub.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/b263d055-1651-443c-9dbe-5117a316bbe2/hungry_shark_game_online.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_off0000f503.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF503	5448 bytes
SHA-256: `03dd841c5d4e6d3efa0cb5238b4ed6c7bcfeea700b835829ec122adbe26ed018`
`font_01_sfnt_off00010789.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10789	1800 bytes
SHA-256: `daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e`
`font_02_sfnt_off00011017.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11017	11172 bytes
SHA-256: `cfc7931682a3f6283d2a158e6de71bb7dd4879e7d6b65df184fcdccf08291335`

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