Malicious PDF — malware analysis report

Static analysis result for SHA-256 7015b14ced13bde5…

MALICIOUS

PDF

78.3 KB Created: 2021-04-18 03:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 45e9a1521fb7acc426e7cb1f4ad9a89d SHA-1: abb3e67e019324387dcd73bc280d98153e7601ad SHA-256: 7015b14ced13bde5f335e45dc88fc5db9dd02700edc3254a8b95e0dcffa87515
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm designed to redirect users to malicious sites. The primary suspicious URL identified is https://vilenefex.ru/strik?utm_term=black+baby+boy+names+starting+with+d, which is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=black+baby+boy+names+starting+with+d PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496165/normal_601375e2140e1.pdfIn PDF document text
    • https://cdn.sqhk.co/wanolugago/5H5SNqT/sazuruvakawobokija.pdfIn PDF document text
    • https://cdn.sqhk.co/guposidum/jykSgcz/90206965699.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414495/normal_604dde38213e1.pdfIn PDF document text
    • https://cdn.sqhk.co/xupodafib/ibiizxR/degurarorik.pdfIn PDF document text
    • https://netexebi.weebly.com/uploads/1/3/0/8/130815192/80536.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/hCkgggf/whatsapp_chat_wallpaper_iphone_hd.pdfIn PDF document text
    • https://cdn.sqhk.co/rogenujudita/bhhjaie/manileraburuwimon.pdfIn PDF document text
    • https://redirusoko.weebly.com/uploads/1/3/4/7/134704710/78e288aa7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_6026dc2995ace.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_60145dbc59e1b.pdfIn PDF document text
    • https://dekitinuro.weebly.com/uploads/1/3/4/8/134871397/0666cb.pdfIn PDF document text
    • https://bufaxivija.weebly.com/uploads/1/3/1/3/131383981/nomakuredujogefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_603b4a2db5611.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/wemovafokaluvekox.pdfIn PDF document text
    • https://s3.amazonaws.com/retisovojor/why_is_ps3_controller_not_charging.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3cdc082-6e87-4d3f-8216-029d4cdd88d8/pride_and_prejudice_jane_austen_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3acfee87-bc98-4c34-80a1-bb0637eba907/what_is_shear_lag_in_composite_beams.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8104b593-5e21-4978-845b-200196c0f1a5/basic_concepts_of_electrical_engineering_by_kuldeep_sahay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fcc7428-a6cf-4074-aecf-a2c17a9b5371/jagajefe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c56c6d49-8351-45c7-89b5-8c093e568764/rokavipevukutosiren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50d98b97-538a-415c-8cf6-9f7cb8b6ab85/kekujafegubozuwote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ff6c81-9c1b-4080-aa3a-974f9a03d4ed/symbolic_logic_is_also_known_as.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/130b95c8-2394-4a55-af2d-0ad9a8136816/wowowesoruxadudaxiri.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/tifoxoli.pdfIn 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_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 5800 bytes
SHA-256: fbd84f589372e8cf895af6d41c341d6a60e55565e5cb60b945294825270be047
font_01_sfnt_off0001086a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086A 10472 bytes
SHA-256: 342b8689a9703bca48207a037a04f7cbbffc37026fcc1c4ef98fc681034796c7

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