Malicious PDF — malware analysis report

Static analysis result for SHA-256 146957f9cf4ba706…

MALICIOUS

PDF

76.9 KB Created: 2021-02-12 03:41:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f4d6ef3eaed7c7cd950699f04c5b5410 SHA-1: 24bff194015d34f40b5b22bf06263b1174392d7f SHA-256: 146957f9cf4ba70681c1b7b98b376e375bf362c0d3fa38bda095a5868bbc3bf6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'druttle.ru' disguised as a driver download, and another to a 'weebly.com' subdomain hosting a PDF. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://druttle.ru/wb?keyword=atf%20box%20usb%20driver PDF link annotation
    • https://pelabomorifij.weebly.com/uploads/1/3/4/6/134628360/c583a7e.pdfIn PDF document text
    • https://liwitozawaben.weebly.com/uploads/1/3/4/0/134042828/1191318.pdfIn PDF document text
    • http://goxuladajozi.22web.org/extent_report_in_selenium_java.pdfIn PDF document text
    • https://vitigamonewus.weebly.com/uploads/1/3/1/4/131406732/givawomepe_gumom.pdfIn PDF document text
    • http://xovonakajo.22web.org/69611250580.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/f6194030218d5.pdfIn PDF document text
    • https://wesuzekubiw.weebly.com/uploads/1/3/1/6/131607103/d98bf43920.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
    • https://s3.amazonaws.com/jepavilutabilel/56974539883.pdfIn PDF document text
    • http://dugipiwem.epizy.com/larujubuniteguwudedawu.pdfIn PDF document text
    • https://s3.amazonaws.com/fipijife/50043244920.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/jirejexugejaxikafazax.pdfIn PDF document text
    • http://vajekalisafemun.rf.gd/vovijutopopelam.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/bebe_rexha_harder_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/grade_10_analytical_geometry_worksheets.pdfIn PDF document text
    • http://laxizal.epizy.com/asbestos_roofing_sheet_in_nigeria.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/34696537111.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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 4692 bytes
SHA-256: d104f22244c08cba6caba09389d44344a517335e5ff94ea34c197f7e337d3d0b
font_01_sfnt_off0000f41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41B 11004 bytes
SHA-256: 0ef1a0ddeb7805d604acbe7561c65ec873ef538221db032f2f0e512aedb397a8
font_02_sfnt_off00011903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11903 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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