Malicious PDF — malware analysis report

Static analysis result for SHA-256 148abe57cc7c4e6d…

MALICIOUS

PDF

89.5 KB Created: 2021-06-14 03:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ee5142007873275abdddeb9acba585aa SHA-1: 3e270cfdc95991ac0ef14073c784ca509745533e SHA-256: 148abe57cc7c4e6d5b76c6500b10a931d86b3268fb06d3aede8cfd081d8423e9
186 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://catamma.ru/pbw?utm_term=snare+solo+sheet+music PDF link annotation
    • https://fuwivofopotafuj.weebly.com/uploads/1/3/5/3/135388640/weguka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459060/normal_6053a6419dbb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476135/normal_5fc91e0b9933b.pdfIn PDF document text
    • https://ruparowix.weebly.com/uploads/1/3/4/3/134350000/juxajew_ninurilad_ferijatit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365621/normal_5fd3d63c3b9c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480728/normal_604ec5f434c92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_603c54739810c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_5fe7c6a2deb3a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fc7b37dc84af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460690/normal_60549f538d454.pdfIn PDF document text
    • https://piriwunetu.weebly.com/uploads/1/3/1/3/131379541/fc6d711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496826/normal_5fdc14e19fe07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495837/normal_6047ec8c52b59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413851/normal_603c695fc2f12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490724/normal_5fe881fe58818.pdfIn PDF document text
    • https://xizulorojude.weebly.com/uploads/1/3/5/3/135391297/2768525.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fodorafirig.pbworks.com/w/file/fetch/144445806/ue_5.7_semestre_5_ifsi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/210e3910-5fde-4064-8c1f-bdde0356edaf/ximevezukume.pdfIn PDF document text
    • http://xumefosux.pbworks.com/w/file/fetch/145269168/gomaworepebetu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a69aa3fd-ca33-40bb-89de-35ab114a5a5e/nigerian_maritime_lawyers_association.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5eb93427-7384-41ee-acf4-66946a141ac3/2013_dodge_charger_pursuit_tire_size.pdfIn PDF document text
    • http://movovepavuzi.pbworks.com/f/positive_remarks_for_students_report_card.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/65452667603.pdfIn PDF document text
    • http://kepojijudiva.pbworks.com/f/peavey_bandit_112_transtube_dimensions.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_off00012322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12322 5140 bytes
SHA-256: 960e106424e7f2bae6056ec89d3988b2995d19fd56be29a6390d2a38c7d2f389
font_01_sfnt_off00013468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13468 10564 bytes
SHA-256: e3d56bea3a175b1ddae34b76085459a4267d0d85adee2b015f25b75e42189116