Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3770bb5abb4aaf…

MALICIOUS

PDF

73.3 KB Created: 2021-03-24 21:05:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e3be2baba03a8fa767f83d6044c8ddb3 SHA-1: dfd1e55156d3d24c6fad09a859c4c2878943d73b SHA-256: ad3770bb5abb4aaf6793b6af331a0e80eeadc3670a7a92b403e2359d6c320a71
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one pointing to a suspicious domain (`midufefew.ru`) that is likely part of a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

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://midufefew.ru/award?keyword=can+you+feel+the+love+tonight+piano+sheet+pdf+free PDF link annotation
    • https://weralafopibobal.weebly.com/uploads/1/3/4/3/134338927/32633de.pdfIn PDF document text
    • https://torobekaxiwe.weebly.com/uploads/1/3/1/3/131380482/jomudalupowejexavox.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/4c80c84abeb168.pdfIn PDF document text
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/zifabotabozeza.pdfIn PDF document text
    • http://kowuterada.mygamesonline.org/22210572739.pdfIn PDF document text
    • http://fb-pageunderreview.com/vobopuluwodesimatinrxs.pdfIn PDF document text
    • http://santand-es.com/benamulujare89ap7.pdfIn PDF document text
    • https://xepidazezupos.weebly.com/uploads/1/3/5/3/135343087/8078438.pdfIn PDF document text
    • http://bexukavinawexov.mygamesonline.org/katatubafegodojubax.pdfIn PDF document text
    • http://gagimubu.mywebcommunity.org/callao_man.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/leteraxewe/91165323525.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/application_security_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/ansible_copy_multiple_template_files.pdfIn PDF document text
    • http://doxokalisawe.myartsonline.com/bahria_town_karachi_balloting_results.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/best_low_fodmap_guide.pdfIn PDF document text
    • http://xogaduzop.atwebpages.com/91313921574.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/barcode_design_software_free.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/92617089951.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/dukuxopokapen.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/local_guide_rewards_2019.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_off0000d1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D5 5372 bytes
SHA-256: f8f7066db79910ebf558d94fd30ae9fa97138202c351208342658efc2a458f58
font_01_sfnt_off0000e429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE429 10480 bytes
SHA-256: 5ba4b779122c784cf2ba9ef7362e81686e2391eb5c8e94ac83027cee14ea40c1
font_02_sfnt_off000107f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F6 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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