Malicious PDF — malware analysis report

Static analysis result for SHA-256 863c06abdd45ed6b…

MALICIOUS

PDF

73.4 KB Created: 2021-05-02 06:49:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 5b4cb04843cbe4a7ee0faa07f217f129 SHA-1: 9d7e7c6d4772c4a139d3355aa97ade4a596d8fbe SHA-256: 863c06abdd45ed6b9ab4ed9a73ec75e709eefde23e51e215c81e5359a987cefa
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, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=write+text+to+binary+file+python PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4484804/normal_5fc6665c9c4ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449406/normal_60582235d0fd3.pdfIn PDF document text
    • https://subisadorug.weebly.com/uploads/1/3/1/6/131637552/632059.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/hgpiixz/khan_academy_answers_key_reading_science.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/whhhjNH/tenikezazojisomoba.pdfIn PDF document text
    • https://boseveju.weebly.com/uploads/1/3/4/5/134595203/vutowuw.pdfIn PDF document text
    • https://nopetozu.weebly.com/uploads/1/3/4/5/134507327/marovixi-dejaguj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389358/normal_5fd1726a7f9ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366623/normal_5fd2ad2dd461a.pdfIn PDF document text
    • https://luvijitakum.weebly.com/uploads/1/3/4/6/134685142/1631751.pdfIn PDF document text
    • https://gisixumaxen.weebly.com/uploads/1/3/1/8/131856636/lefezajogav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384150/normal_5ff839c68ac86.pdfIn PDF document text
    • https://cdn.sqhk.co/fepebage/bF0hfnf/tofotikuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80d0ab3e-5d82-4547-8f02-ffe19150e389.filesusr.com/ugd/776b9b_165d543d6ff346b18659c925763abfd7.pdf?index=trueIn PDF document text
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_3ea20a659cfc416f9fa95f7ec9e80954.pdf?index=trueIn PDF document text
    • https://246406bc-bb0d-4f29-baed-d8a6153a9543.filesusr.com/ugd/3ddeef_56ec42e96708424d974a5d81a44b58a9.pdf?index=trueIn PDF document text
    • https://2521c3e2-5736-45bb-9381-71005f2ffa37.filesusr.com/ugd/c85705_2529a9682e6d42bb976c0d9cb9c98055.pdf?index=trueIn PDF document text
    • https://88bec3ce-9cdd-4818-a95b-bcf8ac49d1e7.filesusr.com/ugd/72df48_17bf1c29da6f4e2ab49b62ec0fa345ab.pdf?index=trueIn PDF document text
    • https://f395d2f2-f939-483b-815f-81062d4747ff.filesusr.com/ugd/be2697_bd4128bfac654e99ab3ae1bdceb70e0f.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_off0000e1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BC 5132 bytes
SHA-256: d9de8aa46090c9146b5a7f23fac9ee9b8ec298dfa01197a545c65bbd5f2b6277
font_01_sfnt_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 10948 bytes
SHA-256: d089183e9517a369f252b5a8af31584f7fdc274cfa771f7c209da367a06a4eca