Malicious PDF — malware analysis report

Static analysis result for SHA-256 d58a686a175f5f6b…

MALICIOUS

PDF

77.2 KB Created: 2021-03-15 22:49:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 1042f5889e950af2b2b3c5c173cb7d4a SHA-1: 280c4a7c8fb993586895820a34716baba3c361fe SHA-256: d58a686a175f5f6bf0ad15e035ad3e6f4b45f258ecd26a25e9623fc0560fed38
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as a link farm, which is a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=what+are+pearls+of+wisdom PDF link annotation
    • https://cdn.sqhk.co/liminekaj/hehehEt/35350111034.pdfIn PDF document text
    • http://tonukavugu.mygamesonline.org/how_hard_is_a_clep_exam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367642/normal_6025cfc532330.pdfIn PDF document text
    • http://ruwufuwetoj.mygamesonline.org/cebuano_tagalog_dictionary.pdfIn PDF document text
    • http://wigageturuv.mywebcommunity.org/i_am_discourses_volume_3.pdfIn PDF document text
    • https://rixafivi.weebly.com/uploads/1/3/1/3/131380000/9585307.pdfIn PDF document text
    • https://xiguvopumodajux.weebly.com/uploads/1/3/1/3/131381006/kukusenonodobub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375340/normal_603f325052be4.pdfIn PDF document text
    • https://tujurexi.weebly.com/uploads/1/3/4/7/134743655/vikas.pdfIn PDF document text
    • https://cdn.sqhk.co/segevenujuka/PihJ1d5/homeadvisor_pro_membership_cost.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/articles_of_organization_md.pdfIn PDF document text
    • https://cdn.sqhk.co/kujufemom/8mijuje/10207942484.pdfIn PDF document text
    • https://cdn.sqhk.co/jabakujivim/jhiixgd/xalonesawaxopuleponisibef.pdfIn PDF document text
    • https://fulojexerewo.weebly.com/uploads/1/3/5/3/135345176/wibula.pdfIn PDF document text
    • https://zebidomixivo.weebly.com/uploads/1/3/4/3/134326720/6161b7ad.pdfIn PDF document text
    • http://xojanefod.mygamesonline.org/31708234470.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/79369746419.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/vujiranezuvik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8e5a805-0aae-41f5-ae30-9363fc7a4a6b/46230173578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/baddfa07-e72e-44e3-834d-9b1633a43f56/how_much_does_it_cost_to_replace_a_transmission_bearing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d20539ca-c404-4010-a4b0-281774584864/kezawugasuluj.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/39324028343.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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 5388 bytes
SHA-256: 432b06b4c4b334bf67a60a7d729d8f40fb52233d1b51b74708b47f130f7215af
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 15216 bytes
SHA-256: 5e89800d8bf9bdab39b594d79a754d19e6da2360f804769f721c7aba823e1458

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