Malicious PDF — malware analysis report

Static analysis result for SHA-256 382764bbd5ee1e0a…

MALICIOUS

PDF

79.1 KB Created: 2021-02-28 17:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 66b938be2a9f0068c10e5990cd798bb3 SHA-1: c08365846d800d53b1729946b50d67539d583874 SHA-256: 382764bbd5ee1e0a219ee0a3bb92bc06138c706fa86fe842450572d3f2ba4a80
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 are part of a link farm designed to manipulate search engine results. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier score of 0.916901 strongly indicate malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'stock market basics' to drive users to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9169

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://druttle.ru/award?keyword=stock+market+basics+pdf+in+telugu PDF link annotation
    • http://francobusiness.com/fronius_5kw_inverter_spec_sheetsi06c.pdfIn PDF document text
    • https://xaweregosakub.weebly.com/uploads/1/3/1/4/131407668/wuvaxidazewera.pdfIn PDF document text
    • https://mirajaxudedina.weebly.com/uploads/1/3/0/7/130775596/3634176.pdfIn PDF document text
    • https://pufenenuboz.weebly.com/uploads/1/3/0/7/130738511/98fcf8c9ad1.pdfIn PDF document text
    • http://nuverlites.online/baweriwesifurixixa9eewn.pdfIn PDF document text
    • https://xutifapob.weebly.com/uploads/1/3/2/7/132712150/waxofiguwiwuvup.pdfIn PDF document text
    • https://garanokuwepo.weebly.com/uploads/1/3/0/8/130874617/wumofurolu_zemezufoxe_rusojiligise_wezuvuv.pdfIn PDF document text
    • http://srakan.space/52128661039wjwdk.pdfIn PDF document text
    • http://55571.ru/gradus_ad_parnassum_debussy_imslpxblbe.pdfIn PDF document text
    • http://bilet-pdd.site/autocad_electrical_drawing_template91bwd.pdfIn PDF document text
    • https://nenodomamik.weebly.com/uploads/1/3/4/0/134095987/6d4c2270dcb5b5.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/temujonuwu/b_t_c_book_ka_full_form.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/case_files_pediatrics.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/12050610229.pdfIn PDF document text
    • https://s3.amazonaws.com/dejazuvorira/54501588463.pdfIn PDF document text
    • https://s3.amazonaws.com/mejifavo/40611232735.pdfIn 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_off0000f6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F1 5664 bytes
SHA-256: 92be463f2eaf66b34a6d383169f16ddf3eb21b0f2926c93a8fcd6a77c35f2319
font_01_sfnt_off00010a05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 10428 bytes
SHA-256: 0e8179c89d89d8853e4ca17dafd426b4e5957d100aa98d93eabff997b22384ee
font_02_sfnt_off00012db4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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