Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ebb07664ac58d81…

MALICIOUS

PDF

73.9 KB Created: 2021-06-07 21:42:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 92fdcfc2d0938341e0fd7969531508b6 SHA-1: 1e5b3836be96112d2d22b724bf906eec6a62f10e SHA-256: 7ebb07664ac58d814f1a3dd45dc3d23e826d686b1f0f2f9d3232a285c8dfda56
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/pbw?utm_term=what+is+the+barf+jelly+bean+made+of PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4489244/normal_605a609dea455.pdfIn PDF document text
    • https://zopopalolidipe.weebly.com/uploads/1/3/4/5/134500843/7577191063713c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382974/normal_6024860e41960.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407302/normal_604648f22f1d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453333/normal_60509a35ecc1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473388/normal_601b666e184a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443823/normal_60b9465ed3083.pdfIn PDF document text
    • https://vebifejelib.weebly.com/uploads/1/3/0/7/130775119/236318.pdfIn PDF document text
    • https://tusogakesi.weebly.com/uploads/1/3/4/6/134661960/6066932.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_5fd86b7007637.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412388/normal_5fdeb35a52c29.pdfIn PDF document text
    • https://gevoxegugajaber.weebly.com/uploads/1/3/4/6/134668378/nexuzegeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414849/normal_60637962b6e17.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/6ab10525-f45a-4616-81cd-783eb909c891/redise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85c66040-3e2d-4b38-ac9c-b03c262f691d/novatel_mifi_7000_mobile_hotspot_fido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65aa1ee-cb10-4775-b1f8-f93e6e903358/15884477043.pdfIn PDF document text
    • http://zajozote.pbworks.com/w/file/fetch/144456060/kubaxumuzalejunig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c7119ca-f04f-4ec0-8e51-09fe615fcd7e/tedegumokepefimijurilife.pdfIn PDF document text
    • http://xugilip.pbworks.com/w/file/fetch/144574452/bemebanurokojanuruvek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10932dea-d5e5-4e55-90d6-2e37b7a25005/kick_full_movie_in_hindi_filmyzilla.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03057162-ffce-461c-8628-e62cd0177f01/91561562289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4eb3436d-32e2-446b-b717-6d937a16487d/jigapuxobobatofumezasut.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/plantronics_bluetooth_headset_pair_with_iphone.pdfIn PDF document text
    • http://jizakatum.pbworks.com/f/tugufap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfdb1fd2-1cae-46ba-bc67-696f244667f5/first_principles_thinking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3c38832-84f8-47b1-953b-2e137fdc1590/lol_surprise_ruckus_card_game_directions.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_off0000e453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE453 5476 bytes
SHA-256: 736e74e016009051ab7a777b2540b2740764a4240149c78a5670de46e183fd2a
font_01_sfnt_off0000f6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DA 10280 bytes
SHA-256: 3141114a9dbe358fe622ddea0fef19c7ac6cf798b1da844dd4039288efd3b77f