Malicious PDF — malware analysis report

Static analysis result for SHA-256 41bad4d0e58b7a7a…

MALICIOUS

PDF

73.3 KB Created: 2021-05-30 04:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a4352ac7f8042b93dcc80276903e8a1c SHA-1: 6a4a3ef58c9084c8a7b551715a9d2f6fc52f1ba3 SHA-256: 41bad4d0e58b7a7ac80c35f7f52f2f619abc514e54455b2aca68e501009cdd6d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9725

Heuristics 6

  • 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.
  • 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://zajinet.ru/strik?utm_term=significado+de+sentido+de+pertenencia+como+valor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484807/normal_603824114f8fc.pdfIn PDF document text
    • https://bifezogutagu.weebly.com/uploads/1/3/4/5/134598372/4328778.pdfIn PDF document text
    • https://teparapilaw.weebly.com/uploads/1/3/4/4/134477765/1e65d8bba51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479905/normal_604752158b742.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401982/normal_60551d2b70700.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379500/normal_6046a82eca3e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501654/normal_5fe63867ec999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390328/normal_60102d4a1d450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_6068c81bbcb74.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4448735/normal_60b2c16e15106.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408170/normal_5feb50b970134.pdfIn PDF document text
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/voroke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421208/normal_6014306be58b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378827/normal_606c0e700b102.pdfIn PDF document text
    • https://gaxowaxogofesix.weebly.com/uploads/1/3/4/7/134719425/6678302.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_6067c3a8a3d46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466366/normal_5ffdefeae7fe3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490724/normal_5ff45fbb63edb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0faf35b1-4f71-406b-b2b6-7adf5ab4e3a8/zusuxusokuvuxojaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00dcf50a-54f6-4a97-a84d-aca6e840093f/best_pulse_oximeter_to_buy_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b669c41-dbb3-4ea6-99a4-55bdf4707c41/doctor_sleep_cast_danny_lloyd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dfa334c-31cd-4d4d-bad0-920b42f36664/momago.pdfIn 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_off0000ea31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA31 5636 bytes
SHA-256: b02090e14654570e947a4e6ba9a43162f2fe816b056731c3b43b997fa93e18e1
font_01_sfnt_off0000fd61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD61 12248 bytes
SHA-256: 5eed65f6dc01ec27643bd9131facf6008e74cc6381298120edc37ffff3d195e7

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