Malicious PDF — malware analysis report

Static analysis result for SHA-256 f811819b1d7ce4ed…

MALICIOUS

PDF

70.3 KB Created: 2021-06-10 06:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e32dfcf5fbc7f94d01973baebad1fb9b SHA-1: 94e9a89dca3e27c1f316825c7bc7070c27477653 SHA-256: f811819b1d7ce4ed8ea11fe208004768aa4a2b5c742e34a102c09de451fe5379
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://infrive.ru/pbw?utm_term=free+download+fnaf+ultimate+custom+night PDF link annotation
    • https://butiziro.weebly.com/uploads/1/3/4/3/134308177/894e679e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460981/normal_5fec15cf15b43.pdfIn PDF document text
    • https://taxufutusa.weebly.com/uploads/1/3/4/5/134514166/banakexabizab-fobibonover.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449984/normal_60303420ed28c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375704/normal_603f2a1688023.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390329/normal_60bcde6bd33b1.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/104aa06a-1f38-4c08-b36d-4f60aef5cd20/procreate_how_to_start.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9198aeea-c705-42b2-82f2-429d2087a40d/60314196376.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/165f95d3-2686-4f51-b0c7-440854cc2164/thesaurus_of_scales_and_melodic_patterns_nicolas_slonimsky_free.pdfIn PDF document text
    • http://buxuxeza.pbworks.com/f/como_calcular_el_numero_de_protones_y_neutrones_en_un_atomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d069de6-54eb-4dd6-8e80-e0f3d3f58c0f/the_didache_greek_text.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e74fedf-603f-40f8-94be-0ace5b5b3f65/68053133434.pdfIn PDF document text
    • http://sujagajo.pbworks.com/w/file/fetch/144524034/discrete_and_combinatorial_mathematics_an_applied_introduction_4th_edition.pdfIn PDF document text
    • http://vodopaw.pbworks.com/w/file/fetch/144880410/gifumoxajimofobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30193702-3e24-45b2-b2d9-24166be25655/will_the_dead_sea_kill_you.pdfIn PDF document text
    • http://kukumepubop.pbworks.com/w/file/fetch/144954714/chemistry_a_molecular_approach_5th_edition_answers.pdfIn PDF document text
    • http://veposasidot.pbworks.com/f/fujupaxajugobejeb.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_off0000d41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 5480 bytes
SHA-256: 95cb588245ec6384b7f9a65a3ac04e77502e93a7c38500b0691673de1679ab00
font_01_sfnt_off0000e6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AE 11052 bytes
SHA-256: 4912788df66cbff7cc609ca819e6c896f5521adbe605646c66b2d05bcda5bf21

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