Malicious PDF — malware analysis report

Static analysis result for SHA-256 253a97abe3f02534…

MALICIOUS

PDF

63.8 KB Created: 2021-05-07 04:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd6cedb73037e60764925f528b65a459 SHA-1: 29d6ab028b66e0069f3f323112f74140b643f984 SHA-256: 253a97abe3f02534c7d560714a38efaefbe3ddd78709ed2a59f1b1fcd6bbacb1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm designed to distribute traffic to potentially malicious sites. The primary URL points to a search result for a common product, suggesting a phishing or scam lure. The ML classifier and ClamAV detection further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8602

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
  • 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://soxebez.ru/strik?utm_term=craftsman+1%252F2+hp+garage+door+opener+won%2527t+stay+closed
    • https://gofegupozomo.weebly.com/uploads/1/3/4/4/134479888/nurosijekopib_desirefesupep.pdf
    • https://nivuvibopaxaji.weebly.com/uploads/1/3/4/5/134588818/4219115.pdf
    • https://tevufipe.weebly.com/uploads/1/3/1/6/131606546/xamuvakazubedik_xetavofab_gesaxuzutigev.pdf
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/7522608.pdf
    • https://jitebemaduk.weebly.com/uploads/1/3/4/6/134692965/8261234.pdf
    • https://govonomuvilikiw.weebly.com/uploads/1/3/4/6/134620083/wewanivalarora_penuv_fisifati_sagowimuku.pdf
    • https://gerikolobel.weebly.com/uploads/1/3/1/3/131398187/dewofafi-japiwi-vazozub-bukufominamegu.pdf
    • http://cocobuka3.xyz/energy_drink_persuasive_speechlh2ar.pdf
    • https://basazujuw.weebly.com/uploads/1/3/5/3/135301233/c4c2e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/padadutiseni/epididymo-_orchitis_treatment_guidelines_australia.pdf
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_f20561490f31468da0804c8d07b30125.pdf?index=true
    • https://s3.amazonaws.com/povodijirig/which_is_best_computer_courses_list.pdf
    • https://s3.amazonaws.com/jinabom/jusanelisuwulo.pdf
    • https://dfa52777-3edb-460f-9b14-ca5101cd4ecc.filesusr.com/ugd/5360f8_6182222ea0db484d9a9be07a1c652f3c.pdf?index=true
    • https://1cf095b7-1d29-4152-b82c-7733cf7ba0c7.filesusr.com/ugd/c1de29_d9188f8c5d41487daf700eae762072d2.pdf?index=true
    • https://b036c58b-26e4-4d46-8f60-5ed4dfa08b02.filesusr.com/ugd/974a4e_c4ffc4bd0bbc4070a76ecf995461ad2b.pdf?index=true
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_699c9b98ab654a7a917d555c57462b62.pdf?index=true
    • https://ecc4b077-82d2-4cf1-ad45-1e482560a890.filesusr.com/ugd/5d7ac5_118a7a252614499f8ed58462d7afeac2.pdf?index=true
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_7f33d4e044a34e40a6930d7bcc3d5be8.pdf?index=true
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2d2.bin
a00bb4b848a284e35bd51da706e4f6dd44a84c2b4b466932a55999e1338654fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D2 5924 bytes

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