Malicious PDF — malware analysis report

Static analysis result for SHA-256 9662f146b5d18c61…

MALICIOUS

PDF

80.2 KB Created: 2021-06-12 03:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c5b752e0b16484ac5f1bc57a559d887c SHA-1: b0e2465c30ea63fe198b4c546ec22dc5c43b84d2 SHA-256: 9662f146b5d18c611de06b5e8ff524c1091105fdb0e15483c181e71c80e19026
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 pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://catamma.ru/pbw?utm_term=airforce+y+group+model+paper+2020 PDF link annotation
    • https://jewezuwexokuj.weebly.com/uploads/1/3/4/7/134717424/5618903.pdfIn PDF document text
    • https://bejejedagaf.weebly.com/uploads/1/3/4/8/134862385/3692377.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/5836084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402706/normal_60322ecd990ba.pdfIn PDF document text
    • https://gokejaxax.weebly.com/uploads/1/3/6/0/136056436/senuras.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481170/normal_5fcee8a3898b0.pdfIn PDF document text
    • https://boxotegiperofog.weebly.com/uploads/1/3/1/3/131398000/bf31cd2795579.pdfIn PDF document text
    • https://wuzakuxiletidu.weebly.com/uploads/1/3/4/3/134322166/begalufixege.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/2c5733ee8177d5.pdfIn PDF document text
    • https://fojexoduzasob.weebly.com/uploads/1/3/4/6/134693365/6240000.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09359f6-ddf3-41be-a089-2121bc0b61a5/63296532232.pdfIn PDF document text
    • http://xutipofapu.pbworks.com/w/file/fetch/145160160/73188010794.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fe385f5-5f1c-408d-b6f1-e549ecdda15b/nifudode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ef5971a-e297-4a26-ae22-97dae84d5d0d/67667656779.pdfIn PDF document text
    • http://wevapejatu.pbworks.com/f/differentiate_between_ram_and_rom.pdfIn PDF document text
    • http://fevosezew.pbworks.com/f/96239261040.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30572d6d-4fd1-4271-a92a-dab1a1eb4e79/what_is_dependency_theory_all_about.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd2df35-724c-403b-bca6-b11400434e98/39213985749.pdfIn PDF document text
    • http://redejok.pbworks.com/f/monster_musume_manga_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b70e3c-4116-49af-bdc7-52d70c1d6dbd/what_is_the_rainbow_bridge_in_the_bible.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E5 5356 bytes
SHA-256: eebfb84f90c88f14edde6550a3e19fd180fc53466593e301b23a8f0e76286805
font_01_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 10644 bytes
SHA-256: 1b05b1fcc8e9d279cceb1f96a2edf83087517048363b9879d35b006fb4a3971c
font_02_sfnt_off00011a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A89 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361
font_03_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 2780 bytes
SHA-256: fc6ac92a2f4eddc4dd0ca7c046b7887873ca6f6d941d0445a1745fd97cb5caa9