Malicious PDF — malware analysis report

Static analysis result for SHA-256 3411b10f7c67ea7d…

MALICIOUS

PDF

79.4 KB Created: 2021-03-22 04:06:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f5149858ac0de6b0195d219c3ea1d506 SHA-1: 7af8c5842f9d1913bb37bc2debedb3fa14d7838e SHA-256: 3411b10f7c67ea7d15b744057e2ca1c3395e36b35a2a1023ca4566947ff965e1
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, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/123?utm_term=cholesterol+medication+in+powder+form PDF link annotation
    • https://ruputosara.weebly.com/uploads/1/3/4/4/134456906/dupakide_zokidulomosip_mebitexavobex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492900/normal_60045bd9384d2.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/WhbjbZv/14880263703.pdfIn PDF document text
    • http://zedateve.mypressonline.com/workforce_planning_definition.pdfIn PDF document text
    • https://gasilarax.weebly.com/uploads/1/3/4/5/134595303/56812.pdfIn PDF document text
    • https://cdn.sqhk.co/kigaratak/dgcliiU/durugavitobidake.pdfIn PDF document text
    • http://rumafelaneli.mygamesonline.org/estructura_o_partes_de_un_texto_instructivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451230/normal_6031465fb11b2.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/djfRLja/15844123094.pdfIn PDF document text
    • http://mowogaw.mypressonline.com/ccna_labs.pdfIn PDF document text
    • https://cdn.sqhk.co/mezomabesoki/ieCbgiG/kingston_coin_op_laundry_machines.pdfIn PDF document text
    • http://pekefosijemibi.sportsontheweb.net/website_analysis_report.pdfIn PDF document text
    • https://pezevibasa.weebly.com/uploads/1/3/5/3/135306661/d7094471.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/chhnih4/mijarukoxudenokutuwavagid.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/junovafojene.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://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_0f1e1123db91452493126d37ae7760c3.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_e2767c96e4364d9c85b45962294fc98b.pdf?index=trueIn PDF document text
    • https://0e818273-c791-4c7a-b20f-750474b78fe4.filesusr.com/ugd/362633_393750f590e64c02867653fa008506c3.pdf?index=trueIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_fd307fe8c5444dbeac3db98a311150bc.pdf?index=trueIn PDF document text
    • https://0d907317-9481-4907-8463-884138e37260.filesusr.com/ugd/c4dbd3_a1dbee92bc63440f88ed7cb8043bc425.pdf?index=trueIn PDF document text
    • http://juwukopegonamu.onlinewebshop.net/38133156072.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F6 5296 bytes
SHA-256: a988dd6f6b86111a6d4a98e6715e3e3e4abd0a3fb66f6d5fd75e80f0e02bea52
font_01_sfnt_off0000f9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E1 12148 bytes
SHA-256: e4e588aeb990e001b696dbf6d341699b913db067c80d749cfbd109e4fa4a373d
font_02_sfnt_off0001222f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1222F 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378