Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd282724e9f376dd…

MALICIOUS

PDF

75.2 KB Created: 2021-03-30 05:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 72fd007e0b1be7f0d76f289be1993c20 SHA-1: c8496fccbfbfa7cf8b8bfcf069c7e93587bc6877 SHA-256: cd282724e9f376ddfe146ce9184c186173f51149b46969ac0e4c0a3cea77af17
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xajibur.ru/wix?keyword=paramedic+drug+cards+pdf PDF link annotation
    • https://fefufivakelazi.weebly.com/uploads/1/3/0/7/130739222/4d64997666935f.pdfIn PDF document text
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/834282.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426541/normal_602dd6772c67d.pdfIn PDF document text
    • http://herss.space/zemusuxukakuwugifa2hj1q.pdfIn PDF document text
    • http://bonboxstudio.com/2725148676u6zrh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369495/normal_5fe79dddac71f.pdfIn PDF document text
    • https://lotuwuwobegeze.weebly.com/uploads/1/3/4/4/134476082/nuwelelub-linevudaker-firuze-balizuxupowuv.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/8718768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409396/normal_600affe1b499b.pdfIn PDF document text
    • https://muwefojiginilu.weebly.com/uploads/1/3/4/5/134512592/revimigowekevezonip.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/13beae68-be40-48d7-b8af-6698007d01b2/bedtime_stories_movie_characters.pdfIn PDF document text
    • https://fdb4f28e-c637-431f-967d-457feef73efb.filesusr.com/ugd/cf5aa9_76ecc5062d384104bca1b7df0f9aa54b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fee9b457-57f2-4755-a133-cfca0d98824f/40245570373.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbec4c6a-b95d-4b23-a772-c5fa5a7af978/dabumesapofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5811f81f-5e42-47f7-976a-dcd25a36c5ef/79817489031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be84ce3-a298-4e4c-8ef4-faa2093ff6c7/78903952026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db1f7321-2b8a-49c2-9ead-e87e883068b6/cuanto_equivale_1_pie_en_pulgadas.pdfIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_2341b99e56a64727b0597c61a093550f.pdf?index=trueIn PDF document text
    • https://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_c5329625100f4794b708d0d853e10288.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_8d706df47c15439680cc61532129cd00.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c1cb9a-d833-430f-b588-94be8275df53/makegukazodinuso.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_off0000e6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F2 5444 bytes
SHA-256: e2cf5a6ec88cb4752c7db48de9c7e3b4fb1e9af0c05a3141480ccf77afc9b9c2
font_01_sfnt_off0000f964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF964 10716 bytes
SHA-256: aceff0b79f0177ff4a18670b4f9073a6c96ae000d9d87ce328ad3c22ef23e79c