Malicious PDF — malware analysis report

Static analysis result for SHA-256 8308ea95fbffdf6f…

MALICIOUS

PDF

88.3 KB Created: 2021-04-27 16:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7dbd6f31cb6f4711762caf48c20a66b5 SHA-1: 2e954e2558217f8210314db448b23fef3a0c591c SHA-256: 8308ea95fbffdf6f8c21d88d2595091dd02e66f572267ddb3c80702d15611598
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing and trojan activity. The document body, though heavily obfuscated, contains text related to 'Zorba the Greek quotes marriage' and metadata indicating it was generated by wkhtmltopdf, which can be used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=zorba+the+greek+quotes+marriage PDF link annotation
    • https://vuzipelafow.weebly.com/uploads/1/3/4/6/134688966/afd694f0.pdfIn PDF document text
    • https://dapadode.weebly.com/uploads/1/3/4/6/134646205/bonasipetudida-vejigatelile.pdfIn PDF document text
    • https://rupedotumimeto.weebly.com/uploads/1/3/1/4/131482941/jipufeg.pdfIn PDF document text
    • https://cdn.sqhk.co/pozazoji/jbypEMx/dokukuguletawix.pdfIn PDF document text
    • https://poxixarusel.weebly.com/uploads/1/3/4/1/134131789/wekodoxujabajik.pdfIn PDF document text
    • https://sizasoko.weebly.com/uploads/1/3/1/3/131384227/25fdb22d.pdfIn PDF document text
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/gotunebedekag_fexasusubaje_xifis.pdfIn PDF document text
    • https://cdn.sqhk.co/towevefizub/hjidB9O/56220353767.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/6hhYtQ6/zasavefari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425919/normal_606935f4bf78b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_5fd9ac934f3fd.pdfIn PDF document text
    • https://zewekoli.weebly.com/uploads/1/3/5/9/135966642/146e96b40ddd.pdfIn PDF document text
    • https://cdn.sqhk.co/kewebogi/ihjjuMO/suwalitorukeviru.pdfIn PDF document text
    • https://cdn.sqhk.co/datolabevev/hbaxQhi/pipewikotawovuxivozexaxa.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
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_e3d38ea01cb44c75860f8f8b7ea5d178.pdf?index=trueIn PDF document text
    • https://1ceef7f3-d523-4f80-a0a4-3aed54d3d17a.filesusr.com/ugd/48841a_dec9709a9850476eab774dd1fe086223.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c885e035-18fd-4e79-a458-3219d583a45c/ronco_food_dehydrator_instruction_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a4175b-bf2f-4454-a8dc-daf937515848/m_s_word_shortcut_keys.pdfIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_d63079b3878e4e3ca11ba46e60684e21.pdf?index=trueIn PDF document text
    • https://6e7ef639-f89a-4701-86f9-710a836f1183.filesusr.com/ugd/12745a_9efae6cb09484dc29304972607a8800a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC5 5128 bytes
SHA-256: 54c8bc8134657a615a451361220730e55947493956c0661517b27d7c11e89b89
font_01_sfnt_off00012042.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12042 10628 bytes
SHA-256: 696ada452e440372866ec3dc1fed24072feefd0aa227c835793391c7a680a58e
font_02_sfnt_off00014454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14454 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f