PDF malware analysis — malicious · 39fdf4e0e650cc11

MALICIOUS

PDF

87.3 KB Created: 2021-04-22 02:21:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23

MD5: 23420839c2ddecafffb8431530e4d93d SHA-1: 287f67396e2f4e562c11719998660f8636bf8935 SHA-256: 39fdf4e0e650cc1139cf70b43d9e3762fbac469a6c583c8f0830390e1da63333

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

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, many pointing to disposable domains, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. No scripts were extracted, but the presence of embedded URLs indicates a phishing or content distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9993

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://fokemale.ru/strik?utm_term=are+smoke+alarms+supposed+to+blink+red PDF link annotation
- https://pujuwofox.weebly.com/uploads/1/3/4/8/134882524/josiwubutajujidi.pdfIn PDF document text
- http://jepisafidezegun.scienceontheweb.net/duxabunipedubivegafila.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4410431/normal_6038ca2f1afde.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4487626/normal_603d2dbe5e933.pdfIn PDF document text
- https://xixasoxi.weebly.com/uploads/1/3/5/3/135324484/a462e9888f.pdfIn PDF document text
- http://moxegelubopidi.sportsontheweb.net/takoboxidazadebiki.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375195/normal_6015c6fd43dc7.pdfIn PDF document text
- https://joxunirefebemi.weebly.com/uploads/1/3/4/3/134319414/5904175.pdfIn PDF document text
- https://mulokigapasol.weebly.com/uploads/1/3/1/0/131070847/watevatenonefuzilar.pdfIn PDF document text
- http://phulop.store/free_3rd_grade_math_workbook8nqhg.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384037/normal_601d29fa2cdb3.pdfIn PDF document text
- http://easterthjg.com/27862958236uy7fk.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4425727/normal_60628a239d800.pdfIn PDF document text
- https://vesukinixemijuw.weebly.com/uploads/1/3/2/6/132696016/zavaru.pdfIn PDF document text
- http://lipuwisapi.mywebcommunity.org/60393918192.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4478148/normal_6023cb6628d3a.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4493610/normal_60469c782573d.pdfIn PDF document text
- http://wozekozexufoxol.scienceontheweb.net/10th_english_book_back_answers.pdfIn PDF document text
- https://fugokepak.weebly.com/uploads/1/3/4/8/134856046/tagunamevezez.pdfIn PDF document text
- https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/lozemepedemi-duvonatovu-luzop.pdfIn PDF document text
- https://japarikadag.weebly.com/uploads/1/3/4/1/134108792/7712449.pdfIn PDF document text
- https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/5712552.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4451352/normal_5fffcba3e5a68.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00011481.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11481	5296 bytes
SHA-256: `b0e17a8772e795dd19f58923d77a1efa1446429ea5af6305782bf293449fc0ff`
`font_01_sfnt_off00012665.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12665	12112 bytes
SHA-256: `ad162d1f1c1abf3b3e4d16cb42961438cf707aafeaaa78dbb20b85e74da33456`

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