Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a009cf9f49196f…

MALICIOUS

PDF

74.8 KB Created: 2021-05-02 01:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 50f2cd456e1a9867a25b7f7130aea0ae SHA-1: 51f9a8b0fc8f3fdc3a18e2387e0c4cd40a3980f0 SHA-256: b0a009cf9f49196fd7c196133eebb50da1527a10f155409dba7c49fbb772f94c
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://ponafet.ru/strik?utm_term=how+to+pass+ib+physics PDF link annotation
    • http://babusokojanog.sportsontheweb.net/english_to_marathi_dictionary_in_format_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_60606314eae1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_604ef580d06b3.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/2020_social_media_trends.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366348/normal_5fd04bb122fcf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419430/normal_5ffb699f6c926.pdfIn PDF document text
    • https://davugunibelerab.weebly.com/uploads/1/3/4/6/134612729/razewa-jakenasuterebop.pdfIn PDF document text
    • http://sujimelowakolop.medianewsonline.com/central_and_peripheral_tolerance_slideshare.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413455/normal_602e3b7606b86.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448113/normal_5fe35ef802316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366385/normal_60459e12b5e70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387241/normal_6056c1d038c52.pdfIn PDF document text
    • https://luzidasagozoro.weebly.com/uploads/1/3/4/3/134319964/29ab6.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/turip/microsoft_word_brochures_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/ruud_silhouette_gas_furnace_limit_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/35955859517.pdfIn PDF document text
    • http://sasaxunofob.atwebpages.com/14038188268.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_off0000e80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE80D 5188 bytes
SHA-256: 06d6b334989fe46e131d93f5d630cf1ba4da9527f3ea9ba68226262e1df7aff0
font_01_sfnt_off0000f9c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C9 10844 bytes
SHA-256: fbbc554cc80087945fb9cda461c9f9952ccc4b3ad7e5962df316077cbb306bcc

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