PDF malware analysis — malicious · a4344f1f4be064d0

MALICIOUS

PDF

72.2 KB Created: 2021-04-07 01:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 6b13727339e54f794f62c2d6c62013c3 SHA-1: 92c88d129e26e656b8b5830f5413ee9049bfefea SHA-256: a4344f1f4be064d04d50c83d51576d523b1a8e574ec8f542ece55bc5ae7ebb8e

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, identified as a link farm. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, and 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are hosted on disposable domains. The ClamAV detection and ML classifier further support its malicious nature, likely for SEO manipulation or distributing further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.7004

Heuristics 5

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
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://jumiwimov.ru/award?keyword=cren%25C3%25A7as+populares+samuele+bacchiocchi+pdf PDF link annotation
- https://cdn.sqhk.co/vefobinibe/jfgfjfN/lativekev.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4386851/normal_60190e3abf8bc.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4380863/normal_5fd2053ed4466.pdfIn PDF document text
- https://cdn.sqhk.co/xidatelo/izhjhei/jekawakebegi.pdfIn PDF document text
- https://cdn.sqhk.co/jigijobofofa/hgifvBm/nanexemafolifujen.pdfIn PDF document text
- https://cdn.sqhk.co/sipebililofo/cFLpJhe/diwumejovurofivafuk.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4451220/normal_60446de32668a.pdfIn PDF document text
- https://cdn.sqhk.co/marixefe/ZDjcWMo/fezevitam.pdfIn PDF document text
- https://cdn.sqhk.co/gupimupiset/e0jeWih/download_village_and_farm_mod_apk_latest_version.pdfIn PDF document text
- https://cdn.sqhk.co/dixejetafap/gSI4Ajf/word_search_creator_app.pdfIn PDF document text
- https://cdn.sqhk.co/nifodotiriru/djbv48L/44229272884.pdfIn PDF document text
- https://cdn.sqhk.co/fematixub/gzhab9b/bapirawejovikivoranigu.pdfIn PDF document text
- https://cdn.sqhk.co/sewujuzanas/cigjagf/download_game_fish_aquarium_mod_apk.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4454049/normal_605aba565f709.pdfIn PDF document text
- https://cdn.sqhk.co/xatuxazaz/9Ijcupj/microsoft_office_network_diagram_template.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_bb93179d5d504070a9c406ad3f34f8ba.pdf?index=trueIn PDF document text
- https://e33362eb-94ba-4427-a888-6f4863169a18.filesusr.com/ugd/36ce96_5ad5843d78f1477da4a8b0c08880d66c.pdf?index=trueIn PDF document text
- https://937a8a2d-b41a-4163-aff8-eda6db263557.filesusr.com/ugd/21e6f2_cc1ac88ac98745afa931875926de5a81.pdf?index=trueIn PDF document text
- https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_e8aacd856a0a4ac48e13bd6458aa78c3.pdf?index=trueIn PDF document text
- https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_13501ff0a0fd4fef9510a0015cf1ccfb.pdf?index=trueIn PDF document text
- https://ef5e9b3f-1a8e-4c79-9b60-34b8f8133c96.filesusr.com/ugd/18574e_a8f855a0cff14e11ae5eb3af52bbff68.pdf?index=trueIn PDF document text
- https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_e3e516c6117d469aa072d69f3c839d16.pdf?index=trueIn PDF document text
- https://abaaaae4-9231-44fc-b12c-ad55ebcc68e7.filesusr.com/ugd/2ca09c_f3c08d7eed0741908169d4729c74b6ee.pdf?index=trueIn PDF document text
- http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f4e3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4E3	5620 bytes
SHA-256: `1d6bfb4f47b3a1d9381fa8645cd362920e54849f1aa040cfd06411dd88fbe9d2`

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