PDF malware analysis — malicious · 28da682cfad88878

MALICIOUS

PDF

77.4 KB Created: 2021-03-21 07:34:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20

MD5: 15e0cf60a75dff6fd322300ef5be019e SHA-1: b52210a6d6edbc01c7122cbe6a2a059276228860 SHA-256: 28da682cfad88878235da002d62d46ac803d9deeed834ceec9dc7d0fe6ad7e78

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for SEO manipulation or phishing. The primary URL, 'https://midufefew.ru/award?keyword=agriculture+grade+10+study+guide+pdf', is presented as a study guide, a common lure. While no scripts were explicitly extracted, the PDF structure and extensive link farm indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/award?keyword=agriculture+grade+10+study+guide+pdf PDF link annotation
- https://cdn.sqhk.co/lisupixiwe/qibjajb/73098202491.pdfIn PDF document text
- https://cdn.sqhk.co/gotirawuz/RVp9UjO/samsung_s20_ultra_original_ringtone_download.pdfIn PDF document text
- https://cdn.sqhk.co/zowonefaso/hfgiieh/8367492650.pdfIn PDF document text
- https://cdn.sqhk.co/vijukifezu/jjOJieD/galaxy_endless_space_shooter_sky_shooting_games_unblocked.pdfIn PDF document text
- https://cdn.sqhk.co/paxepilekot/vhgg3if/xegajafoxula.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4374360/normal_5ff62ba0817c6.pdfIn PDF document text
- https://cdn.sqhk.co/furaxofir/jhNibDk/ultimate_wolf_simulator_mod_apk_unlimited_money.pdfIn PDF document text
- https://cdn.sqhk.co/reriwoduriju/fiaWhbE/soccer_stars_united_pegasus.pdfIn PDF document text
- https://cdn.sqhk.co/biluvetizom/2AggJhe/difference_between_virtual_families_lite_and_full_version.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4484818/normal_6005d90e22a13.pdfIn PDF document text
- https://cdn.sqhk.co/surodamiz/dkgfhbo/download_game_galaxy_strike_2012.pdfIn PDF document text
- https://cdn.sqhk.co/sewujuzanas/g1IihPN/27408749454.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://s3.amazonaws.com/fotojipifuzitul/33430251625.pdfIn PDF document text
- https://e25b7b56-d8f7-44cb-9276-56428e53d1cc.filesusr.com/ugd/63f3e8_ab803447172247629fef3f5be827ae61.pdf?index=trueIn PDF document text
- https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_d8104c53499c436d9ca37585c91ac26f.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/kukupunopedon/dance_basanti_video_song_hd.pdfIn PDF document text
- https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_8368f5cc5026432fbcab7c7beddd86b1.pdf?index=trueIn PDF document text
- https://dcc20dec-0195-4543-b617-cfb82efd15f0.filesusr.com/ugd/30ea26_94994f44ca7f4a2ab05dc58ecdb46dd6.pdf?index=trueIn PDF document text
- https://70010cfe-69b1-4fe9-a336-bdfe2418dc1e.filesusr.com/ugd/f1d680_dfe10676c4ef4a47bf820669f9415dd3.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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f0c4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0C4	5608 bytes
SHA-256: `2085c2c676fe01f7e4716b074ee025ac6d9d78ef61c19981654ba3166ee7f249`
`font_01_sfnt_off000103f4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103F4	10652 bytes
SHA-256: `310a4aaa37a4fbf9ad1645d8aed55607667452e0772f7018dc9376d0975b050e`

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