Malicious PDF — malware analysis report

Static analysis result for SHA-256 74a18a66d801bda6…

MALICIOUS

PDF

82.1 KB Created: 2021-05-09 19:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cce08d912827379b0dbd2f5c1c86015d SHA-1: 6b4aa6ec32842b4feecd87c53640d7f79109649e SHA-256: 74a18a66d801bda632aca22c8d59fc8f68207c7fcf3eb24838207476f23e7975
186 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics and ClamAV as malicious, specifically indicating a phishing or trojan threat. The presence of a large number of external links, including one to 'vilenefex.ru', suggests a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and link farm characteristics strongly indicate an attempt to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=sql+queries+joins+examples+pdf PDF link annotation
    • https://cdn.sqhk.co/kagitenoru/gYhefjd/45955613382.pdfIn PDF document text
    • http://rosoxul.iblogger.org/walmart_true_availability_form.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/despacito_tablature.pdfIn PDF document text
    • http://babusokojanog.sportsontheweb.net/list_of_2d_shapes_and_their_properties.pdfIn PDF document text
    • http://xezixaz.getenjoyment.net/13982861661.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/hjliiid/amazon_fire_tv_4k_specs.pdfIn PDF document text
    • http://juluzenaluziwo.22web.org/everything_michael_buble.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/U60hacV/wewasifuziwegusagifakanoj.pdfIn PDF document text
    • https://cdn.sqhk.co/pezolaje/jcHtSQk/war_card_game_simulator.pdfIn PDF document text
    • http://figejewumoposes.getenjoyment.net/haloalkanes_class_12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a24fdd2-d4a5-4c4b-882b-0f3115751bcf.filesusr.com/ugd/04e6f9_0fafe25268ea4b53b818b3a4a5334a06.pdf?index=trueIn PDF document text
    • https://19eae752-0dc2-40b2-988a-3ead9c543f91.filesusr.com/ugd/dee0a8_47099b11e5e342669b91bcf79ac54631.pdf?index=trueIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_3d7089e53a8948faaaa2745597ccbd36.pdf?index=trueIn PDF document text
    • https://0f3c41ac-de96-4ba7-a517-026d7435d592.filesusr.com/ugd/8631de_cd19762a079c40c1adff10600b570e0b.pdf?index=trueIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_cd0b9ad760bd4c078aab730ec4dec71f.pdf?index=trueIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_0b8bab168c8b4f80b09347ef07297474.pdf?index=trueIn PDF document text
    • https://9329dc78-1a6b-4cc7-98ac-1b36262b7dd5.filesusr.com/ugd/d2be55_f0f8a7cb48864c259b30505784abd999.pdf?index=trueIn PDF document text
    • http://tokumizexafu.epizy.com/jajuvo.pdfIn PDF document text
    • http://xamupufe.epizy.com/24627992093.pdfIn PDF document text
    • http://xotujulenibol.epizy.com/bsc_1st_year_books_in.pdfIn PDF document text
    • https://bed1e925-73f7-457c-87ff-53f226988024.filesusr.com/ugd/d4a8ce_088aa405e597455f96ff4ddb6846b09d.pdf?index=trueIn PDF document text
    • https://b3dfd9c9-1030-471f-a26d-814ea73dbccc.filesusr.com/ugd/d97afa_60fb5657fb4a4420a0795c03771d3d48.pdf?index=trueIn PDF document text
    • https://b73db3ac-2e3c-475a-83ab-7f4668f00a8f.filesusr.com/ugd/80e8fa_da2b5ba8323941db91448a70af2c78c8.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001042f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042F 5560 bytes
SHA-256: 5d2403cb36e7e54d6946d635ec06db7550ae5c521b6c4a4892f30efd07a90849
font_01_sfnt_off0001170f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170F 10624 bytes
SHA-256: cc41590679346c8835db189e59c43a3ea5f68a999a60796b5584210dd7327a64