Malicious PDF — malware analysis report

Static analysis result for SHA-256 f073ba34c9635fd2…

MALICIOUS

PDF

76.2 KB Created: 2021-03-06 07:52:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ef09a7c6682e5461b48f3a89500f5931 SHA-1: e7a1b2b466c9e3d79979c356328ecc99f7ab9982 SHA-256: f073ba34c9635fd2edee58abb80b79b69c080328ade73de366a56bcb7e5b6e14
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://leonvi.ru/123?utm_term=psychoanalytic+theory+definition+psychology PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369189/normal_6025c9fb1a288.pdfIn PDF document text
    • https://serarabasujuz.weebly.com/uploads/1/3/1/6/131606617/7449853.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453901/normal_60396b1b68f30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485801/normal_602fbfdf2678a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488558/normal_5fc7f10c91911.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/4096359.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426941/normal_603b4db3dc72e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460476/normal_6004549106d98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484103/normal_5fca934b88385.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367283/normal_5fe1157c35728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_5fd674fba9cec.pdfIn PDF document text
    • https://xefobizedep.weebly.com/uploads/1/3/1/6/131636625/pixukaniwap_mezevik.pdfIn PDF document text
    • http://berkeciftci.net/klipsch_r-10b_not_workingfizxe.pdfIn PDF document text
    • http://eslife.pro/58775186051j7n79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_601e666b7cd3b.pdfIn PDF document text
    • https://bodonovovo.weebly.com/uploads/1/3/1/6/131607174/be21a6407e.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/a3146eba-22e7-4115-b054-ac591acd926d/geophysical_fluid_dynamics_equations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/431510ef-f45b-4432-87a6-00fecb7c34b9/21720380305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ad28980-7c7d-4b4b-b430-e1b1aa48178e/persuasion_jane_austen_page_count.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_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 5520 bytes
SHA-256: 2c686639c56598005c1fa192c8f523efc718fda33a9d41091875e362c49f5fda
font_01_sfnt_off0001001a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1001A 10432 bytes
SHA-256: cfe21106b72d82cc4b8b3060dabbe6b614c63e9ed042fe65d7c56595ae1518c2

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