Malicious PDF — malware analysis report

Static analysis result for SHA-256 3136065a19408bb6…

MALICIOUS

PDF

72.4 KB Created: 2020-11-18 08:28:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 96083993c3f21d7dc2ae43445e64f3b4 SHA-1: effbdd24aa7dba44947af45f2f3aced997cc13f5 SHA-256: 3136065a19408bb691384a5f58b2d49889498a7f98242bebde4a8f248023f4bd
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm used for SEO manipulation or phishing. The document body, though corrupted, contains keywords like 'Star fleet technical manual 1975 pdf' which likely serve as a lure to entice users to click on the embedded malicious links.

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://trafftec.ru/123?utm_term=star+fleet+technical+manual+1975+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f9ca712ea3f3.pdfIn PDF document text
    • https://jifurutirijiguj.weebly.com/uploads/1/3/4/5/134528482/fotekinure-lodoviwemowam-pifulir-veviwo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372960/normal_5f8d37b693b68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470027/normal_5fb4415044fd4.pdfIn PDF document text
    • https://nagigezivozitos.weebly.com/uploads/1/3/4/3/134340852/lipodabapujefaraz.pdfIn PDF document text
    • https://pibazamigudixo.weebly.com/uploads/1/3/4/0/134000525/xirojetili-gokinoro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412887/normal_5f991a251a627.pdfIn PDF document text
    • https://vujuzujotug.weebly.com/uploads/1/3/4/4/134478410/filopizizovipar-dinegufemifu-piputuxoruk-nopamalitami.pdfIn PDF document text
    • https://fuxamuwilemodo.weebly.com/uploads/1/3/4/4/134478429/zewinevatefuzo.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/03ef3ca5-cec1-4032-a7a7-52919f028d58/bixalakatenowepudagada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b30d127a-ec4a-4190-9245-30c67007c20b/nowisesofivetuw.pdfIn PDF document text
    • https://s3.amazonaws.com/lovetijif/51285975560.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/396eedf2-9a42-45cc-a629-82574fcd1a50/66526869832.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b812bb2a-f27b-433f-aa10-171c681132b9/6412479095.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_off0000db7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7D 5732 bytes
SHA-256: 6a98be8deeb48de5655e40e4309bed11ac64d08e570b255ff20b95798642e424
font_01_sfnt_off0000eeed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEED 11704 bytes
SHA-256: dd22a566fca6011b7530c4ac800271c1d653c02c0abdfeedb7fa3fb5c575e42c

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