Malicious PDF — malware analysis report

Static analysis result for SHA-256 f537f8c76ef78aba…

MALICIOUS

PDF

65.4 KB Created: 2020-12-05 18:12:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: af64e4c74e51d1cccd1a6c1cb86d89e6 SHA-1: d8b7766892449beda008823767cbc48d57564393 SHA-256: f537f8c76ef78aba3de710ffda668fa06c274ce4998b0da186dc861421512fe5
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-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://trafffi.ru/strik?utm_term=how+to+put+degree+symbol+in+google+docs PDF link annotation
    • https://tisikifa.weebly.com/uploads/1/3/4/6/134614219/vokekapifov_jifonosefezonet_jinijowomanoga_gesuxagep.pdfIn PDF document text
    • https://sozipufejelaj.weebly.com/uploads/1/3/4/3/134352325/1918198.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383137/normal_5fc6c96562e63.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/vigirupiruwovilav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_5fa7dcc9e72f9.pdfIn PDF document text
    • https://diwosilanula.weebly.com/uploads/1/3/4/7/134765308/lekejifona.pdfIn PDF document text
    • https://zupavuzinopaz.weebly.com/uploads/1/3/4/2/134265708/3733073.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5f872e3fa0e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5fab8d575d2ed.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/9184aa5e-5644-4f58-b6b0-71db2baf7fe1/what_is_fashion_editorial.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0c67840f1034a5ca82603/t/5fc1bb12173fb5383be34636/1606531859086/nujaxagub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0748fb2a-26ea-4068-b373-942966a183e3/13089708085.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62c93b53-9a6c-48fc-b238-9c6e44782bbb/nedofuvowusamufagurol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c979647f-50ad-44b7-9208-168515d1eece/evinrude_4_hp_outboard_motor_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cbc7c6d964583621a279/t/5fc627de145a8629dc83a5f3/1606821856413/fanoma.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_off0000b905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB905 5476 bytes
SHA-256: 6de340ebe248fe79a791199bcbb9b8bed4a94fc1aee9b8a735ce98d4e2f079a5
font_01_sfnt_off0000cba9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA9 13348 bytes
SHA-256: 0dd6d3677eb1d4078892e1ecb980a9d11fc61cd23c33c9238a4c4f8d7b9a588f

Open this report in the interactive analyzer, or submit your own file for analysis.