Malicious PDF — malware analysis report

Static analysis result for SHA-256 457ecd27772acbd3…

MALICIOUS

PDF

80.7 KB Created: 2021-02-17 15:10:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e016e6c97881069ca9ca6130a8c1e9f8 SHA-1: 58f0ec9b8036cd3226d3c8670b8efacaca67d2cf SHA-256: 457ecd27772acbd324adb01eb59624d20be04eb7b8d5da1b010588a386fa366d
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that directs users to a site offering software downloads, a common lure for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=autocad+architecture+2018+download+student PDF link annotation
    • http://littlenat.space/el_nombre_del_viento_patrick_rothfuss_trilogialq9hs.pdfIn PDF document text
    • http://sputnews.com/hybrid_costing_system5ogcy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_600c37af174f4.pdfIn PDF document text
    • http://magicwoolshop.com/86555166242xt3rr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404290/normal_5ff2d906c0b2f.pdfIn PDF document text
    • http://nat-fru.space/847880646r5ip9.pdfIn PDF document text
    • http://lightly.store/80040523862yx055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448991/normal_5feb4194992fe.pdfIn PDF document text
    • http://trudogoliya.online/how_to_set_sleep_timer_on_time_warner_cable_remotey9ef4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384461/normal_60047c4156243.pdfIn PDF document text
    • http://thecaffeinatedstudent.com/mario_party_ios_gamesc63ar.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422620/normal_601d138cb97a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408476/normal_601fb9618eca1.pdfIn PDF document text
    • http://arthromedshop.xyz/pezurozetutefilupibeplizaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/kitalawusilubotibizot.pdfIn PDF document text
    • https://s3.amazonaws.com/jezaxojipevu/namevijogarisiwukinifuket.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/60407387908.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/fosogepugizegitezid.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 5628 bytes
SHA-256: 35c059841938d2084c261d8950a9e9be6e821852b1dd3c8e7a8ce999ba3e8e52
font_01_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 10304 bytes
SHA-256: c7533b18639905dd2fb0d55b4761dea6ac21d0e6af6f540f413d335fd89b40f1
font_02_sfnt_off00011ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF1 16144 bytes
SHA-256: c5b81f703ebddc697e6824868dcd306aba919aa4c1ec28f594a83a04df97872b

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