Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a1562afabf84868…

MALICIOUS

PDF

73.8 KB Created: 2020-11-11 20:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c82ae1a13768e9ec0e8ec2698a9eebbc SHA-1: 080d423733309ad600af594afd63d612f3bed67e SHA-256: 8a1562afabf848685a65d97c8c1582ae5e4facaada9d089a876542498ea5466d
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 0.9997

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://traffking.ru/aws?utm_term=should+would+could+worksheet+pdf PDF link annotation
    • https://kefozonijufan.weebly.com/uploads/1/3/4/6/134689321/cba2672385c3.pdfIn PDF document text
    • https://mosovokiz.weebly.com/uploads/1/3/4/3/134333023/mofemape-piwoke.pdfIn PDF document text
    • https://kitujimozudek.weebly.com/uploads/1/3/4/3/134375735/buzisezakagimi.pdfIn PDF document text
    • https://tojaluteder.weebly.com/uploads/1/3/4/3/134384479/7780160.pdfIn PDF document text
    • https://kazofinuso.weebly.com/uploads/1/3/4/3/134369681/busaf_sekegezorabi.pdfIn PDF document text
    • https://vafumavuforowa.weebly.com/uploads/1/3/4/4/134489815/tenep_pesezamerinefa.pdfIn PDF document text
    • https://kupifibadobibe.weebly.com/uploads/1/3/4/5/134512214/f2609aed23113b.pdfIn PDF document text
    • https://batatifenosi.weebly.com/uploads/1/3/4/5/134513642/nemonurix-simepakeke-jitevazilawo.pdfIn PDF document text
    • https://wufikasokuwomoz.weebly.com/uploads/1/3/4/3/134359410/0ba5f12cdba6f85.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
    • https://uploads.strikinglycdn.com/files/3ccd4619-74e3-4fc6-abc2-023f13ac2df7/gumegajutumovo.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/40432553081.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c5f0834-7dcc-4ee6-b7bd-87e37450c307/54262330943.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B1 5020 bytes
SHA-256: 29b4e0edc28eac3035d80060781e18cdc38f13e234ef8aa8472842746003d6d1
font_01_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 10296 bytes
SHA-256: 2c5837fe75790e8cd3d5fae87d010d53e7b78c7d33d0315086d3186e2bb996c2
font_02_sfnt_off00010c37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C37 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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