Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dab709f3d93bba…

MALICIOUS

PDF

76.4 KB Created: 2020-11-17 05:21:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 1a7c118cee1a42362b3805b1ed8c474c SHA-1: 97e4c5d7c41be2889fcdbe09227d2bd987b0b4d7 SHA-256: 44dab709f3d93bba99b1993df2a89b2ba41ea2fcf25d2a7c9462e400888ec922
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9996

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://trafftec.ru/123?utm_term=proving+angles+congruent+identify+the+missing PDF link annotation
    • https://vemulasi.weebly.com/uploads/1/3/4/5/134509822/lizodevama.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415742/normal_5f968e2b27e37.pdfIn PDF document text
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/xebosujex-ziripuvukekelu-zidulu-jupimosileziluw.pdfIn PDF document text
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/luwenufe-womedavegiputen.pdfIn PDF document text
    • https://misikeni.weebly.com/uploads/1/3/4/3/134336029/9a0748143e0cd.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/tipot.pdfIn PDF document text
    • https://dopikilazobowu.weebly.com/uploads/1/3/4/4/134488506/4358cb87fda0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392660/normal_5f98f0da9f2e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417207/normal_5f95a4f83a704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5f8b555e8d1c1.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/eba2ae38-d30f-4d14-b1b2-638c5574b444/independent_contractor_invoice_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/43303829244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aee47cb-b134-476d-88c4-7237d3bad328/abaqus_6.14-3_documentation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc02bf8c-3a6f-44c7-a5d3-da3d852a41b0/84847950109.pdfIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/silent_hill_novel.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 5600 bytes
SHA-256: b5413e651fda0cdc72cfe35cd8bf0659f5b6e0c2c800032f95fe015b744fde8c
font_01_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 12216 bytes
SHA-256: e811802e03d8a29fdac72880f96241916a31e5c168a0cadb63425b9a49dba49a
font_02_sfnt_off00010f57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F57 16208 bytes
SHA-256: 1b0cb72d22602438b7e57101475c869d218db2c235f4f8c4774ab6617b658753

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