Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0307e1587fa2085…

MALICIOUS

PDF

74.9 KB Created: 2021-03-18 14:26:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 11cf1f6351948aa5712fd7d2ddc17950 SHA-1: 831fada9b9004ee803ad715a614561a23c1f9108 SHA-256: c0307e1587fa2085f38681c475c6a0fd7617062be4b9ce7a392fb2189f2ac697
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, identified as a link farm, directing users to various PDF documents hosted on multiple domains. This behavior is indicative of SEO manipulation or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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://fokemale.ru/wix?keyword=slow+is+fast PDF link annotation
    • https://cdn.sqhk.co/kadunila/jcif0xN/zupabepatu.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/fjcgcpe/63429763418.pdfIn PDF document text
    • https://zegepefuloruwan.weebly.com/uploads/1/3/4/0/134012378/9970575.pdfIn PDF document text
    • https://cdn.sqhk.co/nudadubuju/hatjfA8/griselda_blanco_documental_discovery.pdfIn PDF document text
    • https://cdn.sqhk.co/joxopejufito/ieuyxoW/mlb_playoff_schedule_2020_printable.pdfIn PDF document text
    • https://votivugaxowo.weebly.com/uploads/1/3/1/1/131163932/b7eedf36327f2f7.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/1hdwlgg/58483078340.pdfIn PDF document text
    • https://guvoruba.weebly.com/uploads/1/3/4/7/134742814/natarumudu.pdfIn PDF document text
    • https://cdn.sqhk.co/nisisepolo/f48zigV/34956062501.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/ridefizison_dewizuviwa.pdfIn PDF document text
    • https://mazanotofubemiz.weebly.com/uploads/1/3/2/6/132681192/3007257.pdfIn PDF document text
    • https://cdn.sqhk.co/larovejadeb/giSghBP/uphall_primary_school_ofsted_report_2018.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zagupijalixi.myartsonline.com/84252953638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f12965f3-aa2f-4392-aab1-a8e29dac8968/photosynthesis_worksheets_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe76d56e-7de1-4a15-a893-1b0654f10ce8/62162281177.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/what_are_moral_values_for_students.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/jogaburovitanizakinidudun.pdfIn PDF document text
    • http://lejiletuvasipib.onlinewebshop.net/split_merge_pages.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_off0000e982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE982 4860 bytes
SHA-256: 76b34b7bb419b64d57c791ad4f97908396729273520c55bcc4ca2b0e49a3617f
font_01_sfnt_off0000fa35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA35 10820 bytes
SHA-256: 9b3d638137516943c4e5cf3e0d55141888681a3e4a22acdbb209ce2f0eb1302f

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