Malicious PDF — malware analysis report

Static analysis result for SHA-256 4506953e75461991…

MALICIOUS

PDF

76.8 KB Created: 2021-05-28 16:07:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6a4c2c603d7f4c0269b25b23c32da0a9 SHA-1: 74ca0b3af2a2e760151b499fb5c21d9b702925dc SHA-256: 4506953e75461991741b1a69094db999dc0980880b9750bf6113c3ba6c1bbf73
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 0.9999

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://pelibifir.ru/123?utm_term=animismo+e+espiritismo+alexandre+aksakof+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380680/normal_601f03ab669cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471253/normal_605679a351526.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376101/normal_60265c194fc30.pdfIn PDF document text
    • https://boxulovakifev.weebly.com/uploads/1/3/4/7/134705425/mosit_tafuvamu_xovitixulixu_fevusi.pdfIn PDF document text
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/5350148.pdfIn PDF document text
    • https://venefosek.weebly.com/uploads/1/3/1/8/131871910/48186c716e.pdfIn PDF document text
    • https://vatalinonabalix.weebly.com/uploads/1/3/4/2/134234662/rexibila_bewawoveviliv_gizamawujoz_pigazevunorew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388815/normal_6000503f5832f.pdfIn PDF document text
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/6960a83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_6014ad292f308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447097/normal_601eb171bf497.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367305/normal_601b543253c15.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/792d5e07-d400-46ff-9638-d75348558b66/how_do_i_study_property_and_casualty_insurance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7d66439-3676-4e2b-bfc2-907f6a978d78/how_to_get_dish_hopper_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1900a07-8cdc-4410-85fe-d52d2ba69190/how_does_hamlet_kill_claudius.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71e11958-e22b-471f-a56b-5f706a660f0f/ejemplos_de_palancas_tercer_genero.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3129ed3-04be-48c2-8a33-5457956353a0/what_are_the_elements_of_discipline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4db2fb-58d1-4df7-97b2-04fb48797c47/2492045061.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_off0000ea5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA5B 5308 bytes
SHA-256: d881a289e4b46e4fafe387470afeb97d219722b1f304f6a54fc86835358b7cdd
font_01_sfnt_off0000fc55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC55 13116 bytes
SHA-256: 14cb5165a0a51dccbdaa871dbd97548fe79e91b1ba344b6f7122ad5c80a8a4cc

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