PDF malware analysis — malicious · 8adcf87dcb98f47d

MALICIOUS

PDF

61.4 KB Created: 2020-11-18 04:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d751126f045869117f277b287bc54507 SHA-1: 15c82424da6f10392e0c2cd83c86de4d7ea8ffc1 SHA-256: 8adcf87dcb98f47d5df082d0960afc9e94ed76fbe93cf4b49abae4f817f5ea41

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external links, with one pointing to 'trafffe.ru', suggesting it's part of a link farm or phishing campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a title that appears to be a lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

Heuristics 5

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.
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://trafffe.ru/wb?keyword=tire%20balancing%20machine%20manual
- https://lozulijulejibog.weebly.com/uploads/1/3/1/8/131857057/noxor.pdf
- https://najunores.weebly.com/uploads/1/3/4/3/134381484/daronunaxitage.pdf
- https://wesemijotabiwa.weebly.com/uploads/1/3/4/6/134622043/c3269d4d6.pdf
- https://galebekamabe.weebly.com/uploads/1/3/4/3/134305591/mudogomofup-tunaloxuz-waruterexulema-mojaxumatorira.pdf
- https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/d29676.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://uploads.strikinglycdn.com/files/62451149-0504-49ff-8715-10788ba785c6/maveminalomefa.pdf
- https://s3.amazonaws.com/jobavo/physical_evidence_notes_name_answer_key.pdf
- https://uploads.strikinglycdn.com/files/5f0af587-8c16-460c-8f91-7dda2b7527c8/tuxugedoludamoda.pdf
- https://s3.amazonaws.com/jukoxisojow/my_hero_academia_heroes_rising_full_free_2020.pdf
- https://s3.amazonaws.com/sezutuma/mokafokazapenedivuk.pdf
- https://s3.amazonaws.com/jarawaxanivu/fire_rated_expanding_foam_data_sheet.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000b566.bin` `8ff738169f795115e99dc94151f9da36ddd0f3186e82a5071c7fc2d37fb55e2b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB566	5124 bytes
`font_01_sfnt_off0000c6aa.bin` `0a2a2622450e58ef034e4746d5dbdd03553de2f8f1d6471e6c03eecaf4cc2e7e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC6AA	10072 bytes

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