PDF malware analysis — malicious · fbf8f983c1162742

MALICIOUS

PDF

78.1 KB Created: 2021-06-07 05:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25

MD5: 7a64780ff4cf17bc38e9686aabaa1812 SHA-1: a96ebbbc32ff0d7e987457d44dceb2ec127b2eef SHA-256: fbf8f983c11627426ca3e482689c61cc7c34896c8b4d8f513acf96a8819b048f

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as Pdf.Phishing.Trojan. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam campaign. The document body, though heavily obfuscated, contains text related to 'Akreditasi snars 1.1 pdf' and references wkhtmltopdf, indicating a potential lure for users seeking accreditation information. The presence of embedded URLs and the nature of the link farm strongly suggest an attempt to redirect users to malicious or spam content.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://pixomot.ru/pbw?utm_term=akreditasi+snars+1.1+pdf PDF link annotation
- https://static.s123-cdn-static.com/uploads/4420019/normal_5fde21efe6371.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4381102/normal_5ffec2ab8474e.pdfIn PDF document text
- https://xepesirivow.weebly.com/uploads/1/3/1/4/131408502/8309475.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4384471/normal_603a85e18f7d6.pdfIn PDF document text
- https://pakefexudexabe.weebly.com/uploads/1/3/0/9/130969404/82cbc1dac2d86.pdfIn PDF document text
- https://gaburizopa.weebly.com/uploads/1/3/1/4/131438784/3171677.pdfIn PDF document text
- https://vunemagerubu.weebly.com/uploads/1/3/4/5/134525741/47ac3c012.pdfIn PDF document text
- https://juziwujaxizeze.weebly.com/uploads/1/3/4/6/134685910/pevopilagapu_juponuvi.pdfIn PDF document text
- https://kodopexo.weebly.com/uploads/1/3/4/6/134693050/xives-wuxutelepuvume-tagozalep-sezeba.pdfIn PDF document text
- https://tewonubipudi.weebly.com/uploads/1/3/6/0/136016370/puwabapilegige-pebem-zipasat.pdfIn PDF document text
- https://vamexerop.weebly.com/uploads/1/3/6/0/136085595/bb0b5119e4.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4368225/normal_60089d4730b5d.pdfIn PDF document text
- https://waguwejulunesu.weebly.com/uploads/1/3/5/3/135301122/3822669.pdfIn PDF document text
- https://modurofeg.weebly.com/uploads/1/3/4/3/134376635/1804549.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://xalomuzavege.pbworks.com/w/file/fetch/144432240/15689096311.pdfIn PDF document text
- http://pokatufaxi.pbworks.com/w/file/fetch/144740373/62091869794.pdfIn PDF document text
- http://kufugaref.pbworks.com/f/what_does_444_mean.pdfIn PDF document text
- http://zikasamu.pbworks.com/w/file/fetch/144460602/zirikimelez.pdfIn PDF document text
- http://giwupiraride.pbworks.com/f/juxenu.pdfIn PDF document text
- http://nefusim.pbworks.com/w/file/fetch/144729180/popakelamamaze.pdfIn PDF document text
- http://difusowafid.pbworks.com/w/file/fetch/144659205/jagovonito.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f43b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF43B	5140 bytes
SHA-256: `6eeff024d5a48902c59de71b16731cfa26f0bf1519ec8766ff45864f71904c1d`
`font_01_sfnt_off000105d5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x105D5	10944 bytes
SHA-256: `ebfbccb92caf877670dabf7c2b78f895b39227ab883cee25aa13754cc4c29db4`

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