Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb74d223d7f922c4…

MALICIOUS

PDF

89.6 KB Created: 2021-03-09 01:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2f7575d07496800dd63a8d21cde210c0 SHA-1: 721360b12e90c3a5ef4c8b6333da587696838da8 SHA-256: bb74d223d7f922c4eac7bee4d30221f0408ff2c851c4b7132c61eb8220d4fbf0
186 Risk Score

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 0.9989

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://gimoguvi.ru/123?utm_term=masked+singer+season+1+monster+performances PDF link annotation
    • https://jegivobepumo.weebly.com/uploads/1/3/4/4/134444156/5380599.pdfIn PDF document text
    • https://wagigezo.weebly.com/uploads/1/3/0/7/130775958/3148311.pdfIn PDF document text
    • https://xudujebu.weebly.com/uploads/1/3/6/0/136090205/tozud.pdfIn PDF document text
    • https://nijuvijoz.weebly.com/uploads/1/3/1/4/131408832/wovatabemux_ketuxileto.pdfIn PDF document text
    • https://matelusa.weebly.com/uploads/1/3/1/4/131406649/6a7316c62df7c94.pdfIn PDF document text
    • https://nililekekikare.weebly.com/uploads/1/3/0/7/130739967/luxekofabopisomasew.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/tosobiw-jadusuloxa-putazebujuran-gurusidawutago.pdfIn PDF document text
    • https://sirowatogiwu.weebly.com/uploads/1/3/2/8/132814809/d340e9a35.pdfIn PDF document text
    • https://gojanaribebiw.weebly.com/uploads/1/3/1/4/131437307/zuduki.pdfIn PDF document text
    • https://jezuvafu.weebly.com/uploads/1/3/5/3/135348480/625fde72.pdfIn PDF document text
    • https://giminefimir.weebly.com/uploads/1/3/0/9/130969553/wavuxizukisaj.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/9475544.pdfIn PDF document text
    • https://pofitefe.weebly.com/uploads/1/3/4/6/134617546/ba12945.pdfIn PDF document text
    • https://peturenu.weebly.com/uploads/1/3/4/4/134401199/79d319c5e736b41.pdfIn PDF document text
    • https://kigadipokifexi.weebly.com/uploads/1/3/0/8/130813079/sadubazivanovegixega.pdfIn PDF document text
    • https://zomurudol.weebly.com/uploads/1/3/4/4/134492975/gajagig-lelitazu.pdfIn PDF document text
    • https://fumamefix.weebly.com/uploads/1/3/0/8/130873833/9127205.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://divifafapinuk.rf.gd/nsw_police_incident_report_phone_number.pdfIn PDF document text
    • https://d1ced4a1-fa29-4c66-b583-77209f32159a.filesusr.com/ugd/c88d8b_0d3311f6029b4db69b48cf40f130e01c.pdf?index=trueIn PDF document text
    • http://bifakafuwal.rf.gd/formation_assistant_de_direction_abidjan.pdfIn PDF document text
    • http://davutawopoban.epizy.com/folefozorejovefo.pdfIn PDF document text
    • http://wijexir.epizy.com/relationship_between_axiology_and_education.pdfIn PDF document text
    • https://e62d90d9-845b-491d-b9b1-804d55ccd6e6.filesusr.com/ugd/6af1ed_eebde0451c2c464eb875250504aebc8e.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_bdf95fed675041209af6e4789b1f0743.pdf?index=trueIn PDF document text
    • http://pozijirume.rf.gd/apache_tomcat_web_server.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_off00011164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11164 5352 bytes
SHA-256: 45bc73f9d7e320b465f2043cbac2714ede509bd05232e3a1122fedfca83fd1f0
font_01_sfnt_off00012386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12386 11328 bytes
SHA-256: 5f6bcc2884ffee45421f1b45fc6ef2b59c04a6cd334beeb9be2b11edc75f3b66
font_02_sfnt_off000149e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E2 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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