Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ee79c3220df2dd…

MALICIOUS

PDF

70.1 KB Created: 2021-03-08 10:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: d2e1312ad762b15a548bd2d0ecd48076 SHA-1: 398ef3f90cf06c067fb2bade5987d3efc9634b2f SHA-256: b8ee79c3220df2ddc3574374780fc8b5b1d40d0a2fa4b24db8e890876bb2ba28
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, containing a significant number of external URLs pointing to potentially malicious sites. The ML classifier and ClamAV also identified it as malicious. The presence of embedded URLs and the structure of the PDF suggest it is designed to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/123?utm_term=hoegh+autoliners+as+annual+report PDF link annotation
    • https://todoxaladavefuk.weebly.com/uploads/1/3/4/5/134529573/zisopitewo-ridosanamiv-barefoli.pdfIn PDF document text
    • https://cdn.sqhk.co/sifalavuxozo/hajdjgq/sepowajiguzofujapomomoluk.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/ecHNMM4/idle_island_city_building_apk.pdfIn PDF document text
    • https://lajawirefif.weebly.com/uploads/1/3/4/8/134869340/88330b3087e57.pdfIn PDF document text
    • https://dizakevusarebiz.weebly.com/uploads/1/3/4/5/134581037/lonifug-folobejowu-betakekag-watog.pdfIn PDF document text
    • https://wilibuluso.weebly.com/uploads/1/3/6/0/136086636/kitufezewurolaguk.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/iiiggfN/cramped_spaces_love_it_or_list_it.pdfIn PDF document text
    • https://kefelewupu.weebly.com/uploads/1/3/4/7/134711224/5103293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_86aed78524434ba2bde382cc61631eca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef83edec-854d-46d5-b472-2d788e2bf16c/ba_ii_plus_calculator_amortization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1293f95-d517-40aa-ae0c-12d0ad4beadd/rosuwasibazamipezejas.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_a5234fefc1764f65887d9f4d68cb4f50.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_b7271be721e44c008eb52e4f143d066c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sasufufa/nccn_guidelines_for_acute_lymphoblastic_leukemia.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_e02e9c1c0d364f93a5dd1f8bd449fff5.pdf?index=trueIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_913f104a030645c18ca599d4d0e6ab28.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/88307353524.pdfIn PDF document text
    • https://1de4b56a-3309-4767-83a2-f1bb1ea7c594.filesusr.com/ugd/a6e5e9_ce88d6278d2b474085519e9bbf0a0e95.pdf?index=trueIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_6768e77a20f045568be98e49a8d359d7.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_off0000d4a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A6 5040 bytes
SHA-256: 7f060aca3931bea2d698f0fd1bb20f0fdb2b509054d368e8412ee3ba18225783
font_01_sfnt_off0000e5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C9 10616 bytes
SHA-256: 1a5a3e1e6cf485beab2410a06532193404b452828097215afcfbd32cb1076e35