Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfcae88350d1ff50…

MALICIOUS

PDF

74.7 KB Created: 2021-03-24 20:38:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b9206a560fdf8159b1af532b33007320 SHA-1: 51c769e51ac21ed1d26b4a1a75bfa21f57666176 SHA-256: dfcae88350d1ff5097e0cc80c452c413bb48975050696ec69def61dd63503d81
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, suggesting it's part of a link farm designed to manipulate search engine results or direct users to malicious sites. The embedded URL 'https://vilenefex.ru/wix?keyword=adding+and+subtracting+rational+expressions+worksheet+precalculus' is a primary indicator of this malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=adding+and+subtracting+rational+expressions+worksheet+precalculus PDF link annotation
    • https://cdn.sqhk.co/peluxisomex/WhcihL9/17470824337.pdfIn PDF document text
    • http://loxesitigogu.iblogger.org/94_toyota_pickup_repair_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/rekubapapup/jhbcgcl/the_elder_scrolls_legends_heroes_of_skyrim_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kugoxepif/chegOgg/mexican_day_of_the_dead_mask_template.pdfIn PDF document text
    • https://cdn.sqhk.co/jowepotoxum/hktXiG3/14691946309.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/8526753d-1454-42ac-8d44-45cfd474f334/what_peoples_choice_award_was_addison_rae_nominated_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bd579ec-49d3-462e-a4ae-a09fc6d87ac3/somewhere_over_the_rainbow_ukulele_tutorial_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2868d4d4-8a42-4182-a34e-a576e57f444a/somarejazon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/939f11d3-375a-4272-b051-cd55f8874a07/david_deangelo_mastery.pdfIn PDF document text
    • http://zisibife.epizy.com/biography_of_abraham_lincoln_free_download.pdfIn PDF document text
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_b7bdc223e3794ff09a5adebd15589e4f.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_7f5121cbe1db4b3ea2ab24211d14f3d6.pdf?index=trueIn PDF document text
    • https://a72a44ae-2aae-4d6a-a6c4-235301d0a62e.filesusr.com/ugd/57436b_cca01fd3599c4f11925e151a566267c5.pdf?index=trueIn PDF document text
    • https://da4cb982-96ac-4827-b01c-1601b1c9977c.filesusr.com/ugd/b05c40_64983a324a4d492fa1e13ac561bdf389.pdf?index=trueIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_ea9304526a4642cc93b6282376fae89d.pdf?index=trueIn PDF document text
    • https://f4ef19d8-372f-49db-bbb6-0f5e16bfa625.filesusr.com/ugd/070799_63108b04ded54e32b4969e42baed9857.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b594f335-dcd8-4eca-a77b-6c5be9eb292e/honda_hrc216_lawn_mower_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5db7b4ee-b4e5-4fe0-8200-0da0c94a45bf/how_to_start_a_coleman_heater.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_75a1f7ce646c47afa881b7cd3e975f69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0f8dc9-2375-42f4-b2dd-102269532fed/fodosudogelowuzi.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_off0000e693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE693 5688 bytes
SHA-256: 957ad063c93c08361600f21f56a956e593fdc6feb6bd3f9bd79aff12900ad1fc
font_01_sfnt_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 10084 bytes
SHA-256: 3d0fbfd6b828bc3d66c67adb7af4ce56ed507d35d7e92632a1dba4afe890c049

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