Malicious PDF — malware analysis report

Static analysis result for SHA-256 d832e86133e0c587…

MALICIOUS

PDF

69.3 KB Created: 2021-03-16 20:44:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 2b5573bc43053be5090c54f5d79f2137 SHA-1: 6efe1d39ec2ae22e2b043040f84ca8fc03d46617 SHA-256: d832e86133e0c587d8d6f6908fd7009dc0569dcf176ee2e303e0c8f64dc20ddb
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The document contains numerous embedded URLs, with a primary external URI pointing to 'https://xajibur.ru/award?keyword=must+have+v3+exercises+pdf', suggesting a lure to a malicious site. The presence of multiple distinct hosts and link farms further supports a malicious intent, likely to distribute further payloads or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/award?keyword=must+have+v3+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416921/normal_604a2e5a92f47.pdfIn PDF document text
    • http://fibutogu.mywebcommunity.org/vopomukixatoruzapekafup.pdfIn PDF document text
    • http://luxusirozutifud.22web.org/snark_guitar_tuner_user_manual.pdfIn PDF document text
    • http://movasolusid.iblogger.org/nefagidaxugebo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481282/normal_603563af15656.pdfIn PDF document text
    • http://kevakigev.medianewsonline.com/94499466665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409413/normal_5ffc310c6a167.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403413/normal_5fecf44c55da8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vupifokixen.rf.gd/rc_cad_full_version_free.pdfIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_1adf3cc51d1840788f641c671715d379.pdf?index=trueIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_051b18f462994c79aed39407d8369af3.pdf?index=trueIn PDF document text
    • https://8ca15cf9-c5bf-4329-906a-32df3c7b5ab7.filesusr.com/ugd/4ca7f5_16c7d1891637496980cca8edc0802b6d.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_82516f03724b4e50b70bf93102fb5cbf.pdf?index=trueIn PDF document text
    • http://gitogopafo.epizy.com/33937929915.pdfIn PDF document text
    • https://59bb578d-b312-442a-858b-1a1a54b18a6c.filesusr.com/ugd/c79b1c_ace8ca59069d4839b0a4b2c370d3dc16.pdf?index=trueIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_a70bfa7a4f924fb299487dbef0cd5f06.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_4130addfea534a37ada1fcda1253b0f5.pdf?index=trueIn 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_off0000dadc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADC 5508 bytes
SHA-256: e71b10b800660ef0fed8784bd640572fdfbab8325a95813f96371f030757b927
font_01_sfnt_off0000edac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 10680 bytes
SHA-256: 1e4ded488140d1a12a3984b6bc788c7b272f9cd7a727ef932d752be113c6d853

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