Malicious PDF — malware analysis report

Static analysis result for SHA-256 679e02dbda6ce82b…

MALICIOUS

PDF

67.5 KB Created: 2020-11-17 05:34:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 50840bd11ddfdc12e2792b512eaf78c8 SHA-1: d24f61a93836fd9d2453d623d863b17abf5d9a7a SHA-256: 679e02dbda6ce82b9e30edf86e03a8a85007cdcebce88f83c3569224d6adca60
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://traffine.ru/123?utm_term=msc+seaside+balcony+fantastica PDF link annotation
    • https://zevenilusowaj.weebly.com/uploads/1/3/4/3/134324486/mubijax.pdfIn PDF document text
    • https://mivegogoke.weebly.com/uploads/1/3/4/3/134365655/moninududa.pdfIn PDF document text
    • https://doxeduzawixufak.weebly.com/uploads/1/3/4/3/134383044/9362944.pdfIn PDF document text
    • https://zepinimokibe.weebly.com/uploads/1/3/4/3/134373719/bivefojosed-doxoxaz-didete.pdfIn PDF document text
    • https://galafiki.weebly.com/uploads/1/3/4/3/134347291/1498430.pdfIn PDF document text
    • https://bapepewemeg.weebly.com/uploads/1/3/4/7/134702997/54ae8c7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368777/normal_5f886c96a4060.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/4141407.pdfIn PDF document text
    • https://duxepanakotijek.weebly.com/uploads/1/3/4/3/134340233/funulo_norebibugu_jukovotuvuzamel_burariwabeji.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/jazulifevalosu.pdfIn PDF document text
    • https://rivisoni.weebly.com/uploads/1/3/0/7/130739016/4156a3b12ab.pdfIn PDF document text
    • https://ruzunaxatan.weebly.com/uploads/1/3/4/3/134340268/welupunazepetav_nisizo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dabatisew/55328054314.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_off0000cab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB6 5168 bytes
SHA-256: f49eb301db2d46f6be9b1b60927fe9a1a9ca22b869fbca2ef78833c70138251c
font_01_sfnt_off0000dc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC70 10668 bytes
SHA-256: 82e582c840483e20383eb5386deb9285231cde96e6a5f469e16a218c9dd29a73

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