Malicious PDF — malware analysis report

Static analysis result for SHA-256 809d5ca6fa70749f…

MALICIOUS

PDF

81.8 KB Created: 2021-02-25 10:36:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a136628f56a10891735b9cb99505cbae SHA-1: 9be2bcdf9e77f9e8409d38983d83e3afdabc635b SHA-256: 809d5ca6fa70749f7088c74b0a7c8fd1a1ed411dd6ef5a6b77a051fe959693e2
164 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are disguised as book downloads, indicating a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to deliver a phishing or trojan payload. Although no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious download lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://leonvi.ru/aws?utm_term=ghatna+chakra+railway+book+pdf+free+download PDF link annotation
    • http://lumobumekola.getenjoyment.net/jim_croce_guitar_songbook.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/bixowarege.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzojivemepe/chjNvR0/memopexixo.pdfIn PDF document text
    • http://obschee.xyz/princess_leia_s_theme_piano_sheet_music5wy4a.pdfIn PDF document text
    • https://waxogisuges.weebly.com/uploads/1/3/0/7/130776632/welewasiravural_jugelenozo_goxirujak.pdfIn PDF document text
    • https://cdn.sqhk.co/vojazodelud/igZhiUy/bajujaxuxar.pdfIn PDF document text
    • https://vujivizu.weebly.com/uploads/1/3/5/3/135305207/nixoga.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/aspiracion_de_secreciones_bronquiales_procedimiento.pdfIn PDF document text
    • https://cdn.sqhk.co/xasurila/2jficJA/licence_plate_numbers_ontario.pdfIn PDF document text
    • https://naxozafo.weebly.com/uploads/1/3/1/4/131483391/6e7b9654.pdfIn PDF document text
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/0b296fbb90.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/sikuva/judgements_not_showing_on_credit_report.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/pelibilipasabeli.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/12658931679.pdfIn PDF document text
    • https://s3.amazonaws.com/rizijubovapuk/49768116582.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/android_studio_emulator_pokemon_go.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/20535960543.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_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 5496 bytes
SHA-256: 8f137799ce327dd4e84377059cafe3267a583760d87eb48c703776de0fd4df38
font_01_sfnt_off0000f537.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF537 10536 bytes
SHA-256: 94849088ce7087bedf9b8ebcc018c5e4bf44c96ecfc74477942f8da6e98ff4e7
font_02_sfnt_off00011977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11977 9732 bytes
SHA-256: e042db7660bf9e2bba101535c7d493e7e377cd0f13de664e165fc402cb7b6132

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