Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b726c37b32b2c6…

MALICIOUS

PDF

69.3 KB Created: 2021-03-29 21:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 03667092f89ba2f6231d22fe975e7c36 SHA-1: 4bdde721e9be4fd35159712f3eaf085f9c525380 SHA-256: 07b726c37b32b2c66d2e63af274027733e78fef64fabcb16857c7ea54271626d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to other PDF files, indicating a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically phishing. The embedded URLs and the heuristic firings point towards the distribution of malicious PDFs, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://lozipotod.ru/wix?keyword=mca+practice+test+grade+7+answer+key PDF link annotation
    • http://wimudevereru.sportsontheweb.net/dovobanujafodisasab.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/wibimoziwak.pdfIn PDF document text
    • http://botefin.medianewsonline.com/27656512059.pdfIn PDF document text
    • https://jexixixusa.weebly.com/uploads/1/3/4/3/134336138/vijali.pdfIn PDF document text
    • https://zovipimisog.weebly.com/uploads/1/3/1/1/131163747/9715367.pdfIn PDF document text
    • https://wiluxuvofox.weebly.com/uploads/1/3/0/9/130969019/bonaxafowusasifo.pdfIn PDF document text
    • https://dudidupu.weebly.com/uploads/1/3/1/3/131380390/c2862f62b84f.pdfIn PDF document text
    • https://voberugupov.weebly.com/uploads/1/3/4/4/134496708/litemunerag.pdfIn PDF document text
    • http://botavubapisod.mywebcommunity.org/90482237393.pdfIn PDF document text
    • https://zebepinexorusog.weebly.com/uploads/1/3/2/6/132695607/petalop-segoweped-viwukifizapoxo-dutipudu.pdfIn PDF document text
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/6407020.pdfIn PDF document text
    • https://sexanugujox.weebly.com/uploads/1/3/4/2/134266496/82828.pdfIn PDF document text
    • http://ratixopawem.mypressonline.com/amazing_grace_flute_and_piano.pdfIn PDF document text
    • https://veburuja.weebly.com/uploads/1/3/0/7/130739173/491a04fc.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/jenagubadopi/how_to_do_standard_deviation_on_ti-36x_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/tewiwifasomaroki.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/37142260367.pdfIn PDF document text
    • https://s3.amazonaws.com/solonebosop/patomijiniwikega.pdfIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/sivigegigagofasi.pdfIn PDF document text
    • https://s3.amazonaws.com/legipalofi/wezuku.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/wipibuzazo.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/b4u_movies_hollywood.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_off0000d342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD342 5552 bytes
SHA-256: d4691de1944af7883d0c78cf3d398eb07eab96ed79abaca647ac792f377b9e3e
font_01_sfnt_off0000e660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE660 9768 bytes
SHA-256: 9d76b7976e1aa90793f442b13015d6ed6ea608ccffb691f566cfcd128c77afa4

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