Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f4e4f791806ca9…

MALICIOUS

PDF

44.9 KB Created: 2020-04-03 05:55:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3d70c6b38fc2eae790747b288df3191 SHA-1: 78e19f2fd7064e7d4be6dc0e71bd660fd4759035 SHA-256: 94f4e4f791806ca9aaa3ccbfebf3eb14b6d0b5e074d173553ec9bd96c8d2cbaf
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by an ML classifier as malicious. It contains a large number of embedded external links pointing to various domains, indicating a link farm or redirection scheme. The document body text is minimal and appears to be metadata or boilerplate, offering no specific lure. The primary malicious activity observed is the distribution of these numerous external URLs, likely intended to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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 http://lisananni.com/uploads/1/3/0/6/130603702/130603702.html#problemas+de+peso+especifico+pdf
    • http://heavenlyjewelrys.com/uploads/1/3/0/4/130488590/eb90bf97f1f3.pdf
    • http://overstockoutletstlouis.com/uploads/1/3/0/6/130620435/nofuxotav.pdf
    • http://sacredspaceforwomen.com/uploads/1/3/0/8/130874248/tubamokaxanuniguvo.pdf
    • http://generaldisarrayband.com/uploads/1/3/0/5/130551941/vaxej_jurozu_vexerilibagoki.pdf
    • http://hpedfoundation.org/uploads/1/3/0/8/130874119/cd0bf3.pdf
    • http://bivouak-lafermedugoret.com/uploads/1/3/0/6/130639472/6488920.pdf
    • http://sboutiquewi.com/uploads/1/3/0/7/130739763/ramisoxep-misoregat.pdf
    • http://bassettconstruction.org/uploads/1/3/0/8/130813643/b578759e3.pdf
    • http://lemoulinetcollection.com/uploads/1/3/0/5/130544447/7084952.pdf
    • http://danapowellenergy.com/uploads/1/3/1/3/131398182/7364503.pdf
    • 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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064a6.bin
98e5bbff86e478358ebd0f88a6864adfc881f432a5c3fbb3de01237a9d0548d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A6 8960 bytes
font_01_sfnt_off00008596.bin
94e4106f1716e30090318c1fe84cb1c7350d87363737346e513263accd000a9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8596 2844 bytes
font_02_sfnt_off00008fac.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FAC 16036 bytes

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