Malicious PDF — malware analysis report

Static analysis result for SHA-256 13f27bbb3891e7f4…

MALICIOUS

PDF

77.2 KB Created: 2021-03-30 07:02:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2eece0862ff20465f11622a4a32937db SHA-1: 53761613166e63a102ed2c4ebed060ebcf004d05 SHA-256: 13f27bbb3891e7f4bd8538546aa977483b4c48e98dd98b2d9fffb98f32c67a28
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier further indicate malicious intent, likely to distribute malware or phishing content through these links. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript for redirection or obfuscation.

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://seumenha.ru/strik?utm_term=comcast+dvr+box+says+boot PDF link annotation
    • http://allieshouseofhope.com/fisher_and_paykel_spare_parts_near_mer0zyg.pdfIn PDF document text
    • https://mojakoxo.weebly.com/uploads/1/3/0/7/130739052/sanavototixis_xijotipesujojuv_jiwedurizulo_sujigibilinot.pdfIn PDF document text
    • https://bisenazogogo.weebly.com/uploads/1/3/4/6/134686343/lajuxasabu.pdfIn PDF document text
    • http://gixapedotamerow.mywebcommunity.org/guzezukidegenupo.pdfIn PDF document text
    • https://zesadokalefon.weebly.com/uploads/1/3/2/6/132681767/kiwabegefukulapili.pdfIn PDF document text
    • https://rivagusej.weebly.com/uploads/1/3/4/2/134266472/jelevinugu.pdfIn PDF document text
    • https://wagoburaf.weebly.com/uploads/1/3/4/5/134524365/2761292.pdfIn PDF document text
    • https://beburasitowetu.weebly.com/uploads/1/3/0/9/130969608/wekuxudewi-fijegesedugej-bewumelof-dewetowema.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/autodesk_revit_mep_2020_tutorial.pdfIn PDF document text
    • http://hookup154.online/track_saw_guide_rail_compatibilityudvl1.pdfIn PDF document text
    • https://kixofugowewo.weebly.com/uploads/1/3/1/8/131872146/1dd83.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c588b236-d9ed-4cef-9edd-4a148f7e9803/walatevalefunixiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6428a20e-521e-42c5-ba86-d20e0b4ddb22/english_to_gujarati_offline_dictionary_free_download_for_laptop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9509e1a9-9332-45da-81dc-19466b57033b/pavazufasogefedorobisebeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22791774-89de-4040-8bcd-8fd00bffa72b/gubobakevesorib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b8f3813-f665-49ab-8825-bc92008b5906/22788117703.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_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 5328 bytes
SHA-256: 12c104feb8fa88e7d6db72fa8ae9605481935eb6ba42b2115cdab878a0cb3cfd
font_01_sfnt_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 10000 bytes
SHA-256: 1cb54fe628f745b9b6bf38438ed5152db25e35e6b9a6e9b5330e0bd8096c0bc9

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