Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec2130448b5d5e8…

MALICIOUS

PDF

65.7 KB Created: 2020-11-13 00:30:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: f413536ab96139cc220f3a93f2da617b SHA-1: ba976a4e8b58d363fdc7d3ad34be61ac1aee07e4 SHA-256: aec2130448b5d5e86125a1b8e21f8de8f39c0f16e270a37adf54db51731d0974
66 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by ML classifiers as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host multiple links on disposable domains, suggesting a phishing or malware distribution scheme. The presence of URLs like 'https://trafffi.ru/strik?utm_term=download+css+from+website' further supports this, as it attempts to disguise malicious activity as a legitimate download. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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=download+css+from+website PDF link annotation
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/tisimaxof-duromaji-kazawiloda-vaxugusegamare.pdfIn PDF document text
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/1162238.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417040/normal_5f96b56b9115b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423772/normal_5f999fd9549cd.pdfIn PDF document text
    • https://waxojokizubow.weebly.com/uploads/1/3/4/4/134482073/dimatodiponajaw.pdfIn PDF document text
    • https://minizaderi.weebly.com/uploads/1/3/4/3/134344024/mizizel_junun.pdfIn PDF document text
    • https://dafuzimobolu.weebly.com/uploads/1/3/4/4/134498283/bowotigu.pdfIn PDF document text
    • https://gekitudijelal.weebly.com/uploads/1/3/4/2/134265938/kogamogo.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/luramamelolem/fuvodotinotaxiwipuj.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzamada/free_download_surat_yasin_dan_tahlil.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/xupogebofonegafazarepot.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/81212875480.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/ivanka_trump_books.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/woxuginaxunul.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_off0000c538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC538 5400 bytes
SHA-256: 23e641f1b7faaaa4f31ba09e8cc5604d5314f8d01111f28280b6d5f3b6207d09
font_01_sfnt_off0000d796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD796 10128 bytes
SHA-256: c8d5bc42afd7a86b91e183ca76c363c029f62127a9c4a22380982b1f5c726178