Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f66b0f03b8bbe7…

MALICIOUS

PDF

77.4 KB Created: 2021-03-08 20:56:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dbe171acc0075b1d1e8c1d1535dc64c0 SHA-1: bc8c93284521e0a331bcbad1774fc4e5d91be44f SHA-256: b0f66b0f03b8bbe7b09e7faacfd5c75010eaaf157edc258355342657fd3028ff
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many pointing to SEO-optimized content, a common tactic for phishing or malware distribution. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_UTM_REDIRECTOR_LINK indicate a large number of links designed to redirect users to potentially malicious sites, with one such redirector identified as https://golowaki.ru/strik. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://golowaki.ru/strik?utm_term=how+to+place+turkey+in+big+easy+oil+less+fryer PDF link annotation
    • https://cdn.sqhk.co/xovinexesun/hheMJid/megijela.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/hhaU5RO/vampires_1998_full_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/daposofoxig/cYhaijI/8445546865.pdfIn PDF document text
    • https://cdn.sqhk.co/jotenitix/thhviiw/58970435767.pdfIn PDF document text
    • https://cdn.sqhk.co/kisereta/ggdieji/vector_marketing_pay.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/zarusegibitumet/94435556282.pdfIn PDF document text
    • https://d926c97b-7f3b-4ec8-a52a-318bcb589338.filesusr.com/ugd/120f26_84c872c6e010437a8018a82f03cb1a48.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/adobe_kuler_free_for_windows.pdfIn PDF document text
    • https://4f65501f-cdae-4966-b9db-49b15ad9d196.filesusr.com/ugd/52b593_5f45013c19ee4b61b124e9d0235eabb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/que_es_biodegradabilidad.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_a66247e58cc842039f089a97b5566be8.pdf?index=trueIn PDF document text
    • https://f9c81679-ddb1-4746-ab40-32673edc426c.filesusr.com/ugd/2eff39_560af46f47b84e6eac02133a3bfd51ac.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/chips_challenge_2.pdfIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_ece2775afb1a4d318c3e295c755cb2e1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovugi/cornerstones_of_cost_management_3rd_edition.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_271ed1ec4ff84b5ebb1612d8cdad2a5d.pdf?index=trueIn PDF document text
    • https://0c7ecde5-8d52-4b6d-bf00-bcb9beb5fd3c.filesusr.com/ugd/b6f5a5_8cac9bd632fc4197b135fcc20257c446.pdf?index=trueIn PDF document text
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_3a8673fa43e940dea00ab4794e3a65cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tobito/football_manager_2018_editor_without_steam.pdfIn PDF document text
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_daa9c644f7a04a77ae3f9f2e8ff7f5d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxotopapozokev/bobs_burgers_seaplane_transcript.pdfIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_a1bac016c53c4f4db44fe325f5956f18.pdf?index=trueIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_18625c9da3214bd996f2b39df4272591.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_off0000f0c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 5544 bytes
SHA-256: 7d64862968285671802d1c55f4efa0cb13cbc1bea77d656f62439e469a9b4bb2
font_01_sfnt_off000103c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C2 10688 bytes
SHA-256: f7aeb98a9ed12a076a9cefa4acde6302f109085ab5da523859ff3a055f1954b1

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