PDF malware analysis — malicious · 471d5be45e705753

MALICIOUS

PDF

72.3 KB Created: 2021-03-28 11:15:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07

MD5: 2b18a704a662977f8e188db903681e93 SHA-1: eac2487e2c9f02e3375d4ba954bdf43fff724760 SHA-256: 471d5be45e705753e0074c82e06f94e553e5e1dda5347f4e68916950f414af4e

126 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is part of a link farm designed for SEO manipulation, pointing to a phishing or scamming operation. The embedded URL, https://leonvi.ru/strik?utm_term=manual+de+gram%25C3%25A1tica+francesa+pdf, is likely a lure to download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 5

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 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://leonvi.ru/strik?utm_term=manual+de+gram%25C3%25A1tica+francesa+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4414174/normal_5ffb2303c0270.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4418192/normal_6023e4a0c4d05.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4392647/normal_604ca22eaafe9.pdfIn PDF document text
- http://kopolade.22web.org/batman_the_dark_knight_returns_comic_espaol.pdfIn PDF document text
- http://wumagakex.iblogger.org/xunasulefilupuvixopovem.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4411220/normal_5fdde75806200.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4407789/normal_603f4e7d329d8.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4484806/normal_60380ce4b4495.pdfIn PDF document text
- https://bigirafu.weebly.com/uploads/1/3/4/4/134494330/a8b8bc612fa8d9.pdfIn PDF document text
- https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/gojetegakerim.pdfIn PDF document text
- https://denutuzuno.weebly.com/uploads/1/3/4/7/134706868/f493ade.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/fifuto/mekebubokagibif.pdfIn PDF document text
- http://kixilum.epizy.com/bragg_s_law_download.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/be2d3e13-8bbf-4f4e-9030-6580f9b2dadd/20271741928.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/479d4528-a9ac-45a7-a1ce-cdc12e3a399d/nate_the_great_story.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/a47c481e-f02a-4085-8228-874280bddfac/how_to_setup_canon_g3000_wifi.pdfIn PDF document text
- https://s3.amazonaws.com/sojaxub/chemico_grinding_paste_safety_data_sheet.pdfIn PDF document text
- http://bowubibegejojop.rf.gd/jeriguvujinowubavimirafas.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/314bc437-1462-48be-8bfd-d766cd5f6e09/database_administration_fundamentals_course.pdfIn PDF document text
- https://s3.amazonaws.com/somamere/fiwinegelolosenake.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_off0000cc58.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCC58	5484 bytes
SHA-256: `d07dadca8a60540fdf453210f0853ff76718b9398775073c597c775543afcd76`
`font_01_sfnt_off0000de5a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE5A	11572 bytes
SHA-256: `0de9501423ef00eafd69ada073512fbd82747f8a1e003ed0c4742789d996eb08`
`font_02_sfnt_off000103c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103C5	4324 bytes
SHA-256: `d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378`

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