PDF malware analysis — malicious · f5104d91e764c539

MALICIOUS

PDF

79.2 KB Created: 2021-03-15 16:49:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20

MD5: 5b1125bbb9f32e1ad18c08c22b5367ee SHA-1: bea95d7c4a64570316072cb826d8a2f829f8d81f SHA-256: f5104d91e764c539880ec62e500f969ec27bc971ecfa1871ade58e423156fe84

194 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a mass of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a tactic of luring users to external sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 7

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://botokaw.ru/123?utm_term=free+printable+lesson+plan+template+weekly PDF link annotation
- https://cdn.sqhk.co/pavupaken/idjakie/99591731216.pdfIn PDF document text
- https://gazelavulokar.weebly.com/uploads/1/3/4/2/134265358/7548497.pdfIn PDF document text
- https://fezagexagowib.weebly.com/uploads/1/3/5/3/135313062/damiwutuponugasoru.pdfIn PDF document text
- https://cdn.sqhk.co/tezofugowura/ihJjiYz/wings_and_rings_menu_bismarck_nd.pdfIn PDF document text
- https://mukekevujawova.weebly.com/uploads/1/3/0/9/130969498/bezanuvoseboziza.pdfIn PDF document text
- https://cdn.sqhk.co/xavexapoxiv/dhajhcI/gerudenubadam.pdfIn PDF document text
- https://cdn.sqhk.co/siripeka/ceggwIr/47894121605.pdfIn PDF document text
- https://cdn.sqhk.co/sileluzorupo/2igay6r/65956955113.pdfIn PDF document text
- https://cdn.sqhk.co/mibazudifij/hfgQggh/subway_surfers_high_score.pdfIn PDF document text
- https://modotetizifoxi.weebly.com/uploads/1/3/1/6/131637555/5245289.pdfIn PDF document text
- https://cdn.sqhk.co/vapatibu/ihheib2/fist_of_fury_2_full_movie.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_80b243baa1594cdbba1563a50dbc3b42.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/kugelilizibuwum/lukuredubiwifivutevosava.pdfIn PDF document text
- http://tubiruk.epizy.com/b_extract_form_rto_maharashtra.pdfIn PDF document text
- https://s3.amazonaws.com/ruzumeb/que_es_estilo_de_vida_segun_autores.pdfIn PDF document text
- https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_02c501c48c414d27ab19cbdd0d6a2cf9.pdf?index=trueIn PDF document text
- http://zowomasi.rf.gd/is_the_captain_underpants_movie_still_on_netflix.pdfIn PDF document text
- http://sulawozunu.rf.gd/55811984273.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ea48.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA48	5108 bytes
SHA-256: `2981256ee82a8084de40e12aba9b52d6f201f010f4545d0097e90a9a78e7e198`
`font_01_sfnt_off0000fb91.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB91	10572 bytes
SHA-256: `78c07acef382e664fa0b1579a8d4ecc1ed71c6341046e3f50eb9a66a22f4d9f7`
`font_02_sfnt_off00011fd3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11FD3	4324 bytes
SHA-256: `1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361`

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