Malicious PDF — malware analysis report

Static analysis result for SHA-256 f37f4d41caf1afa6…

MALICIOUS

PDF

62.0 KB Created: 2021-01-16 23:10:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 57d97a4f46e94ad09f7f18b314f3748e SHA-1: fb3f0cbe2ee645da611dd00c6c10043e6a0ae24f SHA-256: f37f4d41caf1afa6be926df035f54bd6c9b096fe61a5a4317a06366744733c99
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 0.9995

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/wb?keyword=international%20superstar%20soccer%20mega%20drive%20rom PDF link annotation
    • https://babikovinemixe.weebly.com/uploads/1/3/1/8/131856339/manofuzawidevu.pdfIn PDF document text
    • https://befejabenitegi.weebly.com/uploads/1/3/4/5/134530095/79fe33b37751c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420030/normal_5fb30b7ec21e8.pdfIn PDF document text
    • https://lunokebu.weebly.com/uploads/1/3/4/6/134648327/9166801.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480155/normal_5ffb3ef68e644.pdfIn PDF document text
    • https://ximetekorexuven.weebly.com/uploads/1/3/4/4/134489871/484feb611050.pdfIn PDF document text
    • https://xujeloza.weebly.com/uploads/1/3/4/0/134096435/tufurigirajiw-xafinuna-sonaliji-fujafaluzisiruj.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/kagedatabujo/baby_photos_images.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/ielts_listening_answer_sheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/chernobyl_commando_game.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_off0000b59c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59C 5392 bytes
SHA-256: 28f3c6d9ed7db6d0da6c07f6a0224451a99a2066dd600411f639944794223850
font_01_sfnt_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 10368 bytes
SHA-256: c5ba7f1c979a23dc83772462658101b94b533b7b59152dc48b41222551286e9f

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