Malicious PDF — malware analysis report

Static analysis result for SHA-256 2817238b2b6c8737…

MALICIOUS

PDF

93.7 KB Created: 2021-05-01 09:35:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8dbe04c7290b29528d90437c3a1d9938 SHA-1: d6dfcae9d9103ee2b43f67115354e313ebcdf0be SHA-256: 2817238b2b6c8737cba8c392ac52ba5973e9b9bcdf7bbd8c196e3f978a486b85
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=public+administration+jobs+salary+in+pakistan PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476421/normal_606e08a8b06fe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413564/normal_6006e579dee5e.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/dib8knR/spongebob_tickler_apk.pdfIn PDF document text
    • http://medyahanem.com/how_much_does_garbage_disposals_costlcq8n.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/iIFB7eO/black_christmas_songs_instrumental.pdfIn PDF document text
    • http://nezowigivomi.scienceontheweb.net/interior_decoration_company_profile.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/iZPxifr/download_game_thunder_stock_cars_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/EghicG0/53192806366.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/hiijcjr/49888844400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485305/normal_5fff536a85959.pdfIn PDF document text
    • http://copyrightram.net/79379849080slxok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_604195c81c30c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421048/normal_5fdfdf9155039.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sefowolo.atwebpages.com/61733225486.pdfIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_ab6d5b7bbb28400ab93be2907239f1eb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b876deb5-db1a-461d-93d3-48fcf2354f2f/how_to_replace_beats_headphones_ear_pads.pdfIn PDF document text
    • https://3778afa4-e5d9-4bb6-be54-d343c89b577b.filesusr.com/ugd/11c894_68dd183d353748d6bf0ce0d1eadf55a2.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_5c1070a83d904d6aae1653120d969817.pdf?index=trueIn PDF document text
    • http://wupidusujimi.myartsonline.com/30566773239.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4e64985-4cfa-4676-956c-95759009cf74/who_is_the_tree_of_knowledge_of_good_and_evil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71b5bdbb-642f-4a07-9fca-1f4607a85838/6463828119.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_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 5604 bytes
SHA-256: 1d040abebcd3d3a815c4c4b52631f9a3d3c6599231eab03af3f0dcf74fe5a790
font_01_sfnt_off00014273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14273 11456 bytes
SHA-256: a70f0a952939163b30023d6a766613637bf0319764523b2ef9f0c5556b32fa9c