Malicious PDF — malware analysis report

Static analysis result for SHA-256 934d0591e9a8b83d…

MALICIOUS

PDF

71.8 KB Created: 2021-04-04 12:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 72ff8dc3c09bf8ad32f2a7cf49922fe3 SHA-1: bdb0f086881142c54c30612884fae8bad57a30a8 SHA-256: 934d0591e9a8b83dc1154c0df2a769ea4fd7f2a2ecd2a98f93b6c4b0c5eb2afb
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gimoguvi.ru/strik?utm_term=cuanto+es+un+metro+cubico+en+cm%255E3 PDF link annotation
    • https://cdn.sqhk.co/jigitovewuk/iejdii3/disc_blaster_zombie_nerf_gun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372719/normal_6052ff96df4ae.pdfIn PDF document text
    • https://cdn.sqhk.co/gabadifofibo/iaQjcsC/irich_slots_games_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418583/normal_5ffdd89febb4c.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/EhdvpDV/wesubovusoguv.pdfIn PDF document text
    • https://cdn.sqhk.co/lakabarobuk/hcgdtaI/nebudiwujidibuzerojo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473030/normal_601531bb0ea70.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/2600882.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/1252419.pdfIn PDF document text
    • https://cdn.sqhk.co/berirenike/ghaSihi/desexupedamudobobarefaji.pdfIn PDF document text
    • https://cdn.sqhk.co/zogowefu/gdhb5RV/meat_chickens_for_sale_online.pdfIn PDF document text
    • https://cdn.sqhk.co/tivinarafuvu/hbvhejh/business_development_manager_definition_english.pdfIn PDF document text
    • https://fibumexil.weebly.com/uploads/1/3/1/0/131070733/750600.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8962b864-4e0d-4332-a448-e4d2a3ef8e32/36616164707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b36242-4d28-46d2-8254-95bca48ce9f4/cuanto_es_7_5_gramos_en_cucharadas.pdfIn PDF document text
    • https://s3.amazonaws.com/vibasujefir/95531903.pdfIn PDF document text
    • https://s3.amazonaws.com/wopari/google_chrome_apk_for_windows_10.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_off0000d8e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E2 5172 bytes
SHA-256: 0080f4997bf7a32b7e5f17287e5218a9e1cd1fc99c6dfdf5e8388794f1b3b015
font_01_sfnt_off0000ea68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA68 11588 bytes
SHA-256: 5a8dc98b477953aa2978ba712d3a2801ac691aacc143431bcca4ded76eabf6e7

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