Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8bc1341631720b…

MALICIOUS

PDF

82.3 KB Created: 2021-03-20 20:20:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: cac56e1fc651c70befb1f0eeae55ca64 SHA-1: 3ad63b3f3cb809a0a7e192c905a0e1b15d4a7350 SHA-256: 3e8bc1341631720bf09efb3fcf407955efceea305306fb4ec24a995932ab3ef5
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 0.9996

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/123?utm_term=air+force+asvab+study+guide+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465125/normal_5fd077094eb46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393506/normal_603aed938a15a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_604b6e332a3a8.pdfIn PDF document text
    • http://ibkreactiva2020.com/why_do_students_wear_school_uniformsvm3us.pdfIn PDF document text
    • http://itsamorem.com/what_are_the_three_stages_of_the_hero_journeytuf7u.pdfIn PDF document text
    • http://dajexori.mypressonline.com/changing_dewalt_735_planer_blades.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489402/normal_601b64b520951.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/how_many_pages_can_the_average_person_read_in_20_minutes.pdfIn PDF document text
    • http://foxilajat.sportsontheweb.net/50742496814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472484/normal_5fe24f4f3478d.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/99767535237.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/6c94bde6-c3e9-4f11-a745-3ec76fcf2794/what_do_you_do_when_your_ac_remote_stops_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f61ae6-46b1-4721-87af-ddea8e06526e/58800738543.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/fupazodap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36768030-e2c0-4d17-838d-ba58613f8cb4/alamo_colleges_schedule_2020.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_5be8e3a93a0842058c1444550b91745f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc95b9e6-0fd6-4613-a935-44591ec91022/does_bose_make_901_speakers_anymore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85a49bc6-024f-4486-b3fa-84765608fa34/8273169765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1ae524f-962d-4a17-a31a-7218f9f637cc/dexulawo.pdfIn PDF document text
    • https://c216880a-03a2-4774-ab7e-121c93799e8f.filesusr.com/ugd/b5aed9_1f7b79f0603947b59524e7be4d7c9b71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd243872-0048-475b-b48b-bc7cdd9c37c7/dixumi.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_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 5580 bytes
SHA-256: b6a076e97b845a82c4ed16c7f847c6943947a82e2b01a97d9a901377badaa02f
font_01_sfnt_off000116f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F1 10748 bytes
SHA-256: 4b36d82d952db28749d21fcc3dbcfbc1b93527d59c6d345ba7e890fd83762bb1

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