Malicious PDF — malware analysis report

Static analysis result for SHA-256 74d323207f8532e8…

MALICIOUS

PDF

36.0 KB Created: 2020-05-18 08:51:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c4901561d777abe816f2cbbe1de5cf1 SHA-1: 7fd9c4ad0260d8d06fc5ec1a3e4fe958a7347743 SHA-256: 74d323207f8532e8864f17a1eb66cefd85d8327997402dc573c9184268baf1e8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The presence of a "download button" lure and the ML classifier's high confidence score indicate a malicious intent to trick the user into downloading a secondary payload. The document's structure and numerous outbound links are characteristic of a downloader or initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://saintmichelle.store/uploads/1/3/1/8/131855981/131855981.html#burraco+online+free
    • http://wholeheartedgeek.shop/uploads/1/3/0/9/130969497/zowulewarug-kapasawuzo.pdf
    • http://skoobecat.com/uploads/1/3/1/4/131406537/6412b645093.pdf
    • http://herndonwomansclub.com/uploads/1/3/0/5/130538945/nosipusip-zudef-buvebore-jiwetoxewefi.pdf
    • http://tdsdpropertiesllc.com/uploads/1/3/0/6/130621215/fikaza.pdf
    • http://hardyblue.com/uploads/1/3/1/4/131406621/voxusifisopoz-zoladipapise-jarumivoduk.pdf
    • http://ifixedyourcredit.com/uploads/1/3/1/6/131637570/bufomowi_kixisa_sadiw.pdf
    • http://crjmhs.org/uploads/1/3/0/7/130738861/16285.pdf
    • http://floridabuildingrepairs.com/uploads/1/3/1/4/131453134/8312092.pdf
    • http://xn--90abfdsi2acieddb6b.xn--p1ai/uploads/1/3/0/7/130740235/mepobegin.pdf
    • http://perezassociatesllp.com/uploads/1/3/1/4/131454114/825775.pdf
    • http://onlinecoaching-center.com/uploads/1/3/1/3/131383575/banol-vunuxazuk-mosotiwatere.pdf
    • http://clashingmonkey.com/uploads/1/3/0/5/130588346/4c943c2af2.pdf
    • http://oliviacordray.com/uploads/1/3/0/7/130776402/buwexeperakixin.pdf
    • http://olinterpret.com/uploads/1/3/0/7/130776085/1062968.pdf
    • http://dreamstoyourdoor.com/uploads/1/3/1/4/131453449/8dc86d7736.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061be.bin
89af691c4b30d4ccf494d2d575b83eeab32c12ae1d62afa085aed4de63d685fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x61BE 10240 bytes