Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bba7f6b159f48fe…

MALICIOUS

PDF

70.4 KB Created: 2020-11-10 00:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3abf09a79672e3a4f3937c76b13f5dc4 SHA-1: ac7747528c78d53a18ccb8f6df47c562c5154757 SHA-256: 1bba7f6b159f48fe78f6e971e330b28d37133e5e19dea244f91ae4a81a4bea3d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafffe.ru/123?keyword=creating+and+solving+equations+worksheet PDF link annotation
    • https://dofikusoru.weebly.com/uploads/1/3/4/4/134472045/zufalefam.pdfIn PDF document text
    • https://ximazula.weebly.com/uploads/1/3/0/7/130738777/womulesiligawiva.pdfIn PDF document text
    • https://kinefevemupopit.weebly.com/uploads/1/3/4/6/134631160/1501666.pdfIn PDF document text
    • https://zegojipoxe.weebly.com/uploads/1/3/1/0/131069766/doxupozikodowe-gebosedu-desamomat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482863/normal_5fa793d1cde13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405208/normal_5f95d1d5eca0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366374/normal_5f87ebb5ef71a.pdfIn PDF document text
    • https://soxajenukaru.weebly.com/uploads/1/3/0/8/130874283/zokebez_dijupe_demukosorazego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372086/normal_5f991bdda9399.pdfIn PDF document text
    • https://pitimonajavigo.weebly.com/uploads/1/3/1/3/131383860/4492718.pdfIn PDF document text
    • https://visuzajekug.weebly.com/uploads/1/3/4/3/134305902/cd96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371543/normal_5fa7dadc3db43.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/bbb173d0-411d-4991-a447-82333c6a4788/multiplying_cells_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/riddle_transfer_2_walkthrough_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6837413-2191-4e40-aa45-7eb6b85d43c9/colorado_springs_police_blotter_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4a2966e-4bbd-435b-aaee-e8635d1eb07e/mubodugiwefexivitugizesur.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/wadleigh_library_nh.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_off0000d314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD314 5336 bytes
SHA-256: abe96381ecccde0842007dcd298a3f8bd2e254d79391a7e18c57198bf5ba0c95
font_01_sfnt_off0000e53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53F 11496 bytes
SHA-256: 57170d07179792d691b1fdfd4245a0e088a357a39a45e0aa94ba2c187e5bceae

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