Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a7baef7a268d863…

MALICIOUS

PDF

179.6 KB Created: 2021-03-29 09:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: cbf4ea0e38f58d2940f419f7ab6de6a8 SHA-1: 2ca9f7e78f0fe00ad4b48ee3fe13c603526a3ac6 SHA-256: 4a7baef7a268d86357ccd5c39425004276b24f3de0aab8b0340ca806d4819c5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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://soxebez.ru/wix?keyword=roland+park+elementary+school+zone PDF link annotation
    • http://worozoxiw.sportsontheweb.net/beginner_workout_plan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379485/normal_5fd0ed6a95cab.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/2009_proto_rail_manual.pdfIn PDF document text
    • http://befotuke.mywebcommunity.org/punctuation_worksheet_for_grade_6.pdfIn PDF document text
    • http://xoroketogejuxe.mywebcommunity.org/41557610659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379222/normal_602583cb1b0ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454825/normal_602fbe7125327.pdfIn PDF document text
    • http://bexemusu.mypressonline.com/karl_marx_18th_brumaire.pdfIn PDF document text
    • http://kumajamefe.getenjoyment.net/savodofotixakanoku.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369520/normal_6012c08b466de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481170/normal_5fcee7ec245f4.pdfIn PDF document text
    • http://dikegebe.mygamesonline.org/4489068042.pdfIn PDF document text
    • http://xerijegodufiw.mypressonline.com/bailey_and_love_27th_edition_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zukomakiduw.myartsonline.com/7740198804.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/dyson_ball_animal_2_instruction_manual.pdfIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_243dd6b387714ac9aa2770306e883daa.pdf?index=trueIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_a50d7ff59be34477a114e216923b1d78.pdf?index=trueIn PDF document text
    • http://xojudemavu.onlinewebshop.net/75644483048.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00027a28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27A28 5276 bytes
SHA-256: 281299bdf220d65e5d674b16991aa9dcb695c920364bd6c8885cc352c56458fb
font_01_sfnt_off00028bf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28BF8 11328 bytes
SHA-256: 72971fb1b43adbb384d826b385a294423be52f68d71844f73e919de26e07c4b7
font_02_sfnt_off0002b1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B1ED 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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