Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa514a40fc40a148…

MALICIOUS

PDF

77.2 KB Created: 2021-04-15 12:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db2c8f3e2b38175b43cbdeae67fd4528 SHA-1: 192b1efe4d27826954dcc9fe8c94bc7bbc816aae SHA-256: fa514a40fc40a148273097a17e1fbf4e249988a4d52ad78a6498135744ce7f0a
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains and employing UTM parameters, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=how+to+verify+eligibility+for+medicaid
    • http://genusttwsr.fun/xijanutelagizovrv9ap.pdf
    • http://ladunalufim.iblogger.org/xokodovavami.pdf
    • http://helplnstagramcontact6088758.com/xolijitivipapexuwx42we.pdf
    • http://ruvegesa.iblogger.org/26117861084.pdf
    • https://kukanoli.weebly.com/uploads/1/3/4/6/134641169/48af516352ec.pdf
    • http://axecheat6.xyz/anbae_per_anbae_song_free7zu7j.pdf
    • http://nawosofomim.iblogger.org/7926751854.pdf
    • http://remontlegko.info/mubalonu6jmgl.pdf
    • http://wurigebabisu.iblogger.org/what_is_the_geometry_of_h2o2.pdf
    • http://varuvoruva.iblogger.org/galileo_galilei_telescope_images.pdf
    • https://wamurereleveti.weebly.com/uploads/1/3/5/3/135392703/nugapuwoduwopuwe.pdf
    • http://vamoktin.ru/what_should_i_wear_to_a_garden_party_weddingr5eax.pdf
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/085a617db.pdf
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/tubasopizopafuwujizu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f2fe74ca-d7c5-4522-b6ba-9cb42d4a10f2/57196236729.pdf
    • https://bb0106b8-f3e0-414b-a873-a0e24df3f2ad.filesusr.com/ugd/b84a33_ba3a278f0ed14a4ba89b4932004bcb9a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/dda3dae1-db9b-464c-9298-48a9c9acb021/74485600741.pdf
    • https://uploads.strikinglycdn.com/files/7c93b465-5291-4d69-9dbb-e1a9769d186b/72233138941.pdf
    • https://uploads.strikinglycdn.com/files/40834bbd-f601-412c-827c-71e43356fe84/87483601412.pdf
    • http://kirawolus.rf.gd/34450651252.pdf
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_cefbb97629564147b7538cf0c9e13da9.pdf?index=true
    • https://3f054cde-0430-4828-89d0-5f77035cf230.filesusr.com/ugd/d93890_c0fef7f31d2940bca56b48c4dedda65a.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e3.bin
a50e41589cfee0ff32d1f26e7d30080fd1dada3fdcfad196152d8c930d0e2a65		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 5520 bytes
font_01_sfnt_off000103af.bin
08faba02c551ec07460e39f81c14888985894579d40ae0ae1581b14c90802fcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103AF 10564 bytes

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