PDF malware analysis — malicious · 839c634e6aa58eff

MALICIOUS

PDF

77.7 KB Created: 2021-03-04 19:58:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13

MD5: 61a296eedffb88ac72fc6e1ccafa3053 SHA-1: ee1d25f605ae91adc278abcf8a35ac6c8a77613f SHA-256: 839c634e6aa58effba4847bf932638c773694fe2b26d72d466dcb480fd606b1d

186 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing campaign. The primary IOC is the initial external URL which likely serves as a gateway to further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9996

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://xezojetit.ru/wix?keyword=little+kate+ashby+misbehaves+at+augustin+burger PDF link annotation
- https://cdn.sqhk.co/luwokiseg/ifhfmzS/go_long_haul_meaning.pdfIn PDF document text
- https://cdn.sqhk.co/dedejosewor/hXqieOy/life_town_life_simulator_games_like_big.pdfIn PDF document text
- https://cdn.sqhk.co/melivetipi/sN9nnhi/gamerakokavud.pdfIn PDF document text
- https://cdn.sqhk.co/xipapotug/TgijeN6/mamod.pdfIn PDF document text
- https://zexiditituluw.weebly.com/uploads/1/3/4/7/134734655/e0f28c5859bb.pdfIn PDF document text
- https://cdn.sqhk.co/sujubowip/uZQichj/basketball_3d_texture.pdfIn PDF document text
- https://budorezaru.weebly.com/uploads/1/3/4/8/134859022/zibaxivow.pdfIn PDF document text
- https://kuvixirizu.weebly.com/uploads/1/3/0/7/130739951/tubuzodugu-tofufipos-dewegorepe.pdfIn PDF document text
- https://cdn.sqhk.co/suzeboxiwo/iPhfdLu/dunk_shot_basketball_game.pdfIn PDF document text
- https://cdn.sqhk.co/nibedogoxov/heksjg7/anime_wallpaper_phone.pdfIn PDF document text
- https://jukorupojos.weebly.com/uploads/1/3/5/3/135344641/466330.pdfIn PDF document text
- https://cdn.sqhk.co/bepemuno/Shc1jh7/kilexigomufuro.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://s3.amazonaws.com/rakabexozu/30076254609.pdfIn PDF document text
- https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_d7d5181bc4fb4b7d8c1f37199cdc1642.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/kujesulad/livros_em_ingles.pdfIn PDF document text
- https://s3.amazonaws.com/fuzafuzeruwit/juboved.pdfIn PDF document text
- https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_3cf1f293d18c486a868f1ccef344e139.pdf?index=trueIn PDF document text
- https://s3.amazonaws.com/wefadep/mepawofuvozubeki.pdfIn PDF document text
- https://s3.amazonaws.com/pevuwarobuvowa/game_bubbu_cheat_mod_apk.pdfIn PDF document text
- https://s3.amazonaws.com/lixasifasi/bcbsok_claim_review_form.pdfIn PDF document text
- https://054d5c26-596f-48a3-87a7-0fc79031e5db.filesusr.com/ugd/599026_a77bed423510461c82b397688cef33df.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000e5d4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE5D4	5176 bytes
SHA-256: `b092d6b18aa96ca5da81b62b4789353f68a100f3ecf1c1eab95d4f10a8e8c662`
`font_01_sfnt_off0000f74a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF74A	10372 bytes
SHA-256: `8d84630ca161814c36e2dd95301e2d93e693bdf86a91289cf3a95d3624685bc2`
`font_02_sfnt_off00011ac1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11AC1	4324 bytes
SHA-256: `b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c`

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