Malicious PDF — malware analysis report

Static analysis result for SHA-256 89aa8dd20c182cc4…

MALICIOUS

PDF

72.2 KB Created: 2020-12-01 00:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: b50042e5b4c80b3e673260aad7c5ede6 SHA-1: 1061cd2b82876b56a43c5b13e655cda68f44b11c SHA-256: 89aa8dd20c182cc4d1c36f9595c74a1b2fef1854b885e03b938736498ae348ff
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external links, suggesting a link farm or redirection to malicious content. The document body, though heavily obfuscated, appears to be a lure related to educational worksheets, aiming to trick users into clicking embedded URLs.

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://traffset.ru/123?utm_term=triangle+proportionality+theorem+worksheet+answers+12-1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479938/normal_5fc4f61d2ae9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454299/normal_5fa38decbe7c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382952/normal_5fc2707694217.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_5fbcbaaae4857.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/84717.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374698/normal_5f8aa54ae5be5.pdfIn PDF document text
    • https://xemupawiked.weebly.com/uploads/1/3/4/3/134321325/kukejasasezatu.pdfIn PDF document text
    • https://mawoluji.weebly.com/uploads/1/3/4/2/134265904/sixemi-pogupex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_5fae37183e195.pdfIn PDF document text
    • https://napuraviseso.weebly.com/uploads/1/3/4/3/134322211/xeponekewaga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/song_ids_roblox_2019_rap.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3EE 5656 bytes
SHA-256: 07ab8aaddc5352b2b7e2bb7db94fac0d3ba2ee558c748ec77b1d912d2c06592d
font_01_sfnt_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 10908 bytes
SHA-256: 58c1f83311ee90812b9a79000427d33dec944211024d9cf88c7d92cac5b1ac03
font_02_sfnt_off0000fc7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7E 16104 bytes
SHA-256: f6b2237c9407b6795f4161b92e2ccfe4d968ff950fb456d111e6c5790a844bd8

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