Malicious PDF — malware analysis report

Static analysis result for SHA-256 b473dbfeabd0aacf…

MALICIOUS

PDF

92.9 KB Created: 2021-03-15 19:33:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c275e8b61ad52eb6eee4322749827f0b SHA-1: ced46d1640d3d4a77c1da1bcc3fcd9ba549e04fa SHA-256: b473dbfeabd0aacf0ed2d5c4032aa56e2f36f5367627fad9570742657f76a213
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=mcatjelly+study+schedule PDF link annotation
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/rivarazatis-ganedadu-mivelad-powifusidisijas.pdfIn PDF document text
    • http://filemarker.store/muscle_and_a_shovelhc72s.pdfIn PDF document text
    • https://guvefivilemu.weebly.com/uploads/1/3/4/3/134397682/kivoriw-davodirowagum-megateli-mudomudap.pdfIn PDF document text
    • https://xufolonul.weebly.com/uploads/1/3/2/6/132695880/809c22ea0.pdfIn PDF document text
    • http://vexetifiridik.mypressonline.com/aws_certified_solutions_architect_book.pdfIn PDF document text
    • http://zathkatow.xyz/41612030451eqlap.pdfIn PDF document text
    • http://verifybadgehelp.com/how_to_find_density_with_dimensions_and_massa0qcm.pdfIn PDF document text
    • http://nariwunuzaw.scienceontheweb.net/duwogumubuwuvitapisamegut.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383915/normal_5ff4727a22a02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490930/normal_600b63b429524.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384046/normal_5fe8fd407af02.pdfIn PDF document text
    • https://nipukidifa.weebly.com/uploads/1/3/0/8/130873732/tinaxuzeliliz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392237/normal_6024530f920d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5fc924f62d5ab.pdfIn PDF document text
    • http://instup.xyz/170869321718sk78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_60400db2c8c62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F0 4732 bytes
SHA-256: 252eadbc5e17be654e82bfc3bdf9955ae933cc6535922bfbfd2055852f7e06a3
font_01_sfnt_off0001341f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1341F 10652 bytes
SHA-256: f6db2ced46a486412cf9b03f8aacd6b82a76b9aae2db5320acef015b34d26344
font_02_sfnt_off00015895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15895 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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