Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50008923fea1389…

MALICIOUS

PDF

73.1 KB Created: 2021-03-05 21:07:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a1e41860fdff5d64c8ba47a25472bc4e SHA-1: 31bc397c349eec7fb4454bdab256cad3b13e20e8 SHA-256: d50008923fea1389982fee72e793284cde78898340b4fcd49b94c439c6a44396
156 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 0.9997

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://crophysi.ru/strik?utm_term=plantronics+-+backbeat+fit+3150+true+wireless+sport PDF link annotation
    • https://getenulezawo.weebly.com/uploads/1/3/4/8/134897364/bd62243d2.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/rufetotup_kotav_dojovukijalowat_paxikewinurira.pdfIn PDF document text
    • https://belawutuvuzepim.weebly.com/uploads/1/3/4/6/134605506/zabazetawatumixuzo.pdfIn PDF document text
    • https://tikoresi.weebly.com/uploads/1/3/0/7/130775690/bupipi-bodixoputatevun.pdfIn PDF document text
    • https://gixovazaviv.weebly.com/uploads/1/3/5/9/135982549/735318deb1.pdfIn PDF document text
    • https://goremafijitem.weebly.com/uploads/1/3/4/6/134617837/2ce16fe8043246.pdfIn PDF document text
    • https://zuvexege.weebly.com/uploads/1/3/0/8/130814851/nodulok_vorubefeg_lixuzowoxemon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482018/normal_60269602cecdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426556/normal_5fd2262960db5.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/wokesabisevo/samokixixebedogelo.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/amundi_sa_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/sovafibukedonerisotipota.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/47741634235.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/16577830510.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c0c827c-11e4-42b2-95f9-401bf9a9b4cb/blender_modeling_tutorial_2.8.pdfIn PDF document text
    • https://s3.amazonaws.com/libowebujakux/67252608612.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/fokusiladujibukuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f38f954-e4ae-471c-b9c6-84933f295d11/11033335933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa855f2-6888-4dc5-9c7e-95383afc0432/voketelowimogemin.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/bloody_mary_movie.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_off0000dbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD4 5820 bytes
SHA-256: 8ddb3bd82d114f46af0189bda72fe00716e48b259829bd6bca7d48a4e6986113
font_01_sfnt_off0000efd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD3 11024 bytes
SHA-256: c3d832b2faa0aeeda0e1cbdf24f40876c67c1f1132003a2e750929a57a76ce98

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