Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbb1cf0e7490c62…

MALICIOUS

PDF

77.0 KB Created: 2021-06-02 03:44:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9478e3295eb648f0bba38f7fddc7c138 SHA-1: 4578d57c19881b698f3d41e04890cfdfd0122a7b SHA-256: 6dbb1cf0e7490c626536d0efb8509f1b5939959cbf127f065c6340fc042ac4ab
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=osmosis+lab+report+introduction PDF link annotation
    • https://penikowe.weebly.com/uploads/1/3/4/8/134888725/6fb48.pdfIn PDF document text
    • https://fewabobur.weebly.com/uploads/1/3/4/7/134713859/7746643.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485939/normal_601580ff95a97.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413002/normal_6003c5af78650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490547/normal_60274354df7b3.pdfIn PDF document text
    • https://zosagejezigim.weebly.com/uploads/1/3/4/7/134709887/xopiwezi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_6016c128e95c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495039/normal_601416f158217.pdfIn PDF document text
    • https://fodumalape.weebly.com/uploads/1/3/2/6/132695584/300c37fb926f9f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368970/normal_604f5f868b32d.pdfIn PDF document text
    • https://gituruledutaza.weebly.com/uploads/1/3/4/4/134401886/sonedovo-jowewajag.pdfIn PDF document text
    • https://xozagalan.weebly.com/uploads/1/3/4/5/134519104/3031226.pdfIn PDF document text
    • https://jejaparax.weebly.com/uploads/1/3/5/3/135332208/7034e514.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_60182efce8d1a.pdfIn PDF document text
    • https://vezidinudavad.weebly.com/uploads/1/3/4/4/134481570/5d77267e69cbbc.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/2de47014-405f-46da-90b5-2345778a8be5/46030479358.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6641896b-f354-4ac2-afaf-5d819e9e228e/81407857817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48c8415e-8a81-494d-906c-bb2ea649bf74/list_of_mandatory_documents_required_by_iso_9001.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec3f2e12-afab-4d7d-bbbb-ed4105ba3117/rajus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea800706-dae4-44d0-b0ee-963224b7d5b1/najuji.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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 5384 bytes
SHA-256: 223f0825b5354dc64b5c173c0e73765b2777e7dcdbb85efe86b384f100c84146
font_01_sfnt_off0001017c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017C 10848 bytes
SHA-256: 32e2b5862f50c099c8703644a7099a63317855b11be93fd90b1ac62a29c3da0b

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