PDF malware analysis — malicious · 5b42f03d68f3cff0

MALICIOUS

PDF

73.5 KB Created: 2021-04-03 21:56:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14

MD5: 443091691b69290e489e01bd10b6d5cf SHA-1: 98693d3b355088c2264670cfec82c58549775adf SHA-256: 5b42f03d68f3cff0c167a39e3bc7dc58d274451505b6cad94991e4fe2134a7b4

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous external links to other PDF files hosted on various domains, with a significant portion of these domains flagged as disposable. The primary purpose appears to be SEO manipulation or distributing further malicious content through these links.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/123?utm_term=shadowing+n3+pdf PDF link annotation
- http://nexipufogavajid.getenjoyment.net/business_administration_books_free_download.pdfIn PDF document text
- https://vugovarekuluf.weebly.com/uploads/1/3/1/6/131607096/jumoxiv-jiborike-jozujuvimokipeg-pixarukikesom.pdfIn PDF document text
- https://movediwifed.weebly.com/uploads/1/3/2/6/132695881/d7c6622e7515.pdfIn PDF document text
- http://dumigegin.medianewsonline.com/batifikoparuxe.pdfIn PDF document text
- http://zuvalasit.mypressonline.com/rawexotusilu.pdfIn PDF document text
- http://tajuliwelofiti.medianewsonline.com/62183777780.pdfIn PDF document text
- http://xagekofa.iblogger.org/the_irregular_at_magic_high_school_light_novel_volume_16.pdfIn PDF document text
- http://gemofesane.medianewsonline.com/33741327014.pdfIn PDF document text
- http://vamefegali.mywebcommunity.org/4621278779.pdfIn PDF document text
- https://fozaxebefi.weebly.com/uploads/1/3/4/5/134584315/gebonupulebizuvaja.pdfIn PDF document text
- http://rujitexoxobag.mypressonline.com/lightning_arrester_seminar_report.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://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_ddd047e434ea420da60d29a00e182657.pdf?index=trueIn PDF document text
- http://jurorinidup.rf.gd/77155138030.pdfIn PDF document text
- https://1058d175-53f8-4d86-9201-ae9c1fc74009.filesusr.com/ugd/62a633_9f9ecd201b9d434fb520c8e7196017b7.pdf?index=trueIn PDF document text
- http://jorasixu.myartsonline.com/17777586668.pdfIn PDF document text
- http://dirazonun.myartsonline.com/game_design_books_for_beginners.pdfIn PDF document text
- http://zutaturusix.myartsonline.com/tegiriku.pdfIn PDF document text
- http://besenasoxa.epizy.com/bssc_inter_level_exam_notification.pdfIn PDF document text
- http://nolusiwafaki.epizy.com/xakiwetunotem.pdfIn PDF document text
- https://254a6a59-343e-4b7e-907c-c4819e171fff.filesusr.com/ugd/decf6f_28c922b7bdef4407947aa652fc089fe1.pdf?index=trueIn 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_off0000cdcc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDCC	4948 bytes
SHA-256: `6e6445e93d18ab2ce375c7a054a4aceb53f48f031033c5e94e3e441f85cdde1f`
`font_01_sfnt_off0000de9e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE9E	17196 bytes
SHA-256: `c53183fb61fe9382395392d55fe97bd77440170530a65b6a793bbde04d1fe737`
`font_02_sfnt_off00010af4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10AF4	4324 bytes
SHA-256: `1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e`

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