Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a17e75fae884ff9…

MALICIOUS

PDF

73.3 KB Created: 2021-06-09 02:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 4d6156638ab6ac26a7407e1f9c30e7f8 SHA-1: 675175c2d96075ee7386c1ddae368891b4804801 SHA-256: 6a17e75fae884ff98197a30b7dd1440aa0ae2da453da5f1285b2ee63a909f7fd
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 0.9993

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://ketchas.ru/pbw?utm_term=welles+wilder+delta+phenomenon+pdf PDF link annotation
    • https://fidexirubopuzer.weebly.com/uploads/1/3/2/8/132815065/9d6c817018cf.pdfIn PDF document text
    • https://lidalukedewad.weebly.com/uploads/1/3/4/6/134664428/welus.pdfIn PDF document text
    • https://zisafidavilux.weebly.com/uploads/1/3/2/8/132814196/341011e4c.pdfIn PDF document text
    • https://gopogaxewose.weebly.com/uploads/1/3/4/0/134013169/3996551.pdfIn PDF document text
    • https://gabesusot.weebly.com/uploads/1/3/4/8/134895193/9416810.pdfIn PDF document text
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/dawife_beregojibir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477367/normal_5fd99f3353106.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487927/normal_6066303b0ebbe.pdfIn PDF document text
    • https://tagipuzato.weebly.com/uploads/1/3/0/7/130776724/67d3d8033d98.pdfIn PDF document text
    • https://wikojenuvovada.weebly.com/uploads/1/3/4/2/134266286/2960663.pdfIn PDF document text
    • https://tisuzozolida.weebly.com/uploads/1/3/6/0/136087901/3354082.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/tixetosexujada_vikibagazipitum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387814/normal_5fca1a9ec5f19.pdfIn PDF document text
    • https://sajulivos.weebly.com/uploads/1/3/1/1/131164476/3166562.pdfIn PDF document text
    • https://nubizuvilokimid.weebly.com/uploads/1/3/5/4/135401099/5e839.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/0d88d2f9-ec4e-4a79-b9c2-23f15f9a46c5/wedamokovugumipudo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad55fb2-1514-4adc-a1fa-08a3295e2323/lesifirorugizikasufaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/378eed93-3bc6-4a52-b636-24f25a885a65/xovizezupasipanadimumete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8f7e6f-8e84-414c-bf10-4e04ed1b4e59/15840408887.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b28d0f52-3552-4fe5-91a1-194618d811cc/nezonudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e561766b-f5ff-4c0a-ac3a-53de88ee96b7/mudisolisilavetukuluvolen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3243e42c-c76c-40c6-9f93-db6f134e5795/7748553993.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0697e77-ce7b-411b-bb89-2e09bd1d7dba/jexulaw.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_off0000e0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AD 5388 bytes
SHA-256: 7e6ef5740569740bfaabe19395f2ad9cf728ea658c8a8fd26309653ed34aa851
font_01_sfnt_off0000f2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EB 11348 bytes
SHA-256: 3b6d42e01a3a1930deb8d2cd1ba508925682c05329310e8fc89e7e7c7df64581