PDF malware analysis — malicious · 9a30c98963db8fba

MALICIOUS

PDF

73.7 KB Created: 2021-03-01 20:40:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 8f67c9d2a6011c479ccf3ab38a9a15da SHA-1: 1ea7adf6485fa2df26ee31deab533f595c6b8f1a SHA-256: 9a30c98963db8fba5ffd2ee62e21b76174d83b07d7095547088ef960bed5b78b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm point towards malicious intent, likely to redirect users to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://fokemale.ru/strik?utm_term=average+salary+communications+manager+toronto
- https://jawoxufogor.weebly.com/uploads/1/3/6/0/136022219/2704787.pdf
- http://swiss-gear-top.xyz/compulsory_heterosexuality_and_lesbian_existence_citationrw2k7.pdf
- https://wedabivugexum.weebly.com/uploads/1/3/0/9/130968949/4007153.pdf
- https://fudesatalaponu.weebly.com/uploads/1/3/2/7/132710537/c2b8b4283b8.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://birijigasexow.epizy.com/adobe_premiere_pro_cs6_free_download_for_pc.pdf
- http://voxaxos.rf.gd/dell_venue_8_pro_t01d_specs.pdf
- https://s3.amazonaws.com/purawuma/45343581085.pdf
- https://s3.amazonaws.com/gapivegek/37248530465.pdf
- https://s3.amazonaws.com/lorifumofelu/assets_path_android_xamarin.pdf
- http://xugomoxuniwemo.rf.gd/cerberus_slayer_guide_osrs.pdf
- https://s3.amazonaws.com/xoguwavosuje/49278909980.pdf
- https://s3.amazonaws.com/fobupojowojon/bedardi_guiya_nagpuri_dj_song.pdf
- https://s3.amazonaws.com/ropuba/how_do_i_track_a_ups_priority_mail_package.pdf
- http://nafivinada.rf.gd/formal_leave_of_absence_letter_request.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_off0000e145.bin` `1ada508ef5fbc07ac4626090fff9c908d65f6e13b4c5ce30ba499d1c993d0e6c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE145	5268 bytes
`font_01_sfnt_off0000f32e.bin` `fffef00af89d5db913ad142c09fde802c4ab0f9e235df4b641f7751d71bd6aa9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF32E	11328 bytes

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