Malicious PDF — malware analysis report

Static analysis result for SHA-256 085f71547168cf21…

MALICIOUS

PDF

70.1 KB Created: 2021-02-09 06:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 52f42a41f561de1c4e8dd7b6a445ffe4 SHA-1: a0e69d76cd81bcf6280360118370a3d4502cc6df SHA-256: 085f71547168cf2132040096f64f959a50795a5e46c68f4e63dddf4094c894d0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/123?utm_term=ready+new+york+ccls+grade+8+ela+answer+key+2018 PDF link annotation
    • https://datedevob.weebly.com/uploads/1/3/1/3/131381982/14f333a6b.pdfIn PDF document text
    • https://linazoforup.weebly.com/uploads/1/3/0/8/130814758/009c04b7.pdfIn PDF document text
    • https://dufevirefat.weebly.com/uploads/1/3/1/4/131438490/9454086.pdfIn PDF document text
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/dddbde3.pdfIn PDF document text
    • http://crispyset.online/cars_2_movie_download_in_isaidub3vo4h.pdfIn PDF document text
    • https://kipusisuvosa.weebly.com/uploads/1/3/1/4/131406826/4900e811.pdfIn PDF document text
    • https://vojizozovogimum.weebly.com/uploads/1/3/0/7/130740342/sogaza_lopeki_sojepupawit.pdfIn PDF document text
    • https://moxuronanupew.weebly.com/uploads/1/3/4/5/134597487/6a0c215ac3.pdfIn PDF document text
    • http://nesobaka9.xyz/gijimamani6mghj.pdfIn PDF document text
    • http://myluckywin.site/say_what_brian_culbertson_sheet_musicfh5mm.pdfIn PDF document text
    • https://dodonixufaf.weebly.com/uploads/1/3/1/4/131453867/9435002.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/cc34dce9c712629.pdfIn PDF document text
    • http://boost-store.net/lifolohm381.pdfIn PDF document text
    • http://sluzhba1.net/zaxaragewoxubumekofipijozsiq0.pdfIn PDF document text
    • https://suviliter.weebly.com/uploads/1/3/1/4/131453542/6933791.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/bubodeliza/cisco_anyconnect_ordering_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/best_crisp_percale_sheets.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05E 5892 bytes
SHA-256: 2ad96d91a0aa36f8e3b6b29516896dd6f91226530356818bd5806baa8ae2e08b
font_01_sfnt_off0000e49a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49A 10824 bytes
SHA-256: 64b26797d108381310cd3c68ee2a6386c64386bc1576d463ea80dfeb790940b5

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