Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce965d37e7de3eff…

MALICIOUS

PDF

38.3 KB Created: 2020-03-13 17:58:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f3207ef66c14ff9cf47358fb1690818a SHA-1: 51eebb8c973361c46dceca82a19bd4093d080495 SHA-256: ce965d37e7de3eff5fbcadfcb9c46d5b6871200250556d2c6e821ad2b25b0a57
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that are also listed in the extracted URLs. The primary attack pattern appears to be directing users to a vast number of external PDF documents, likely for SEO spam or to host further malicious content.

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://fearlessculture.org/uploads/1/3/0/4/130476075/130476075.html#geologic+time+scale+activity+flvs
    • http://personalnetworkappliances.net/uploads/1/3/0/2/130273617/lumew_podutanomime.pdf
    • http://southeasternclubcl.com/uploads/1/3/0/7/130776399/wogovu_kerumopagit_dosodafena.pdf
    • http://fridaynightfoodfight.com/uploads/1/3/0/8/130813400/xozadip.pdf
    • http://riretireeschapter94.org/uploads/1/3/0/2/130289333/4463333.pdf
    • http://princewindsor.com/uploads/1/3/0/6/130604425/rivuniniveresa_voduxuxizo_segawa.pdf
    • http://porktexas.com/uploads/1/3/0/4/130489830/gelujoge-wabadimaxako-zuvaxodedenos.pdf
    • http://uganeuro.com/uploads/1/3/0/5/130589171/9590968.pdf
    • http://moretondivingandmarinecontracting.com/uploads/1/3/0/8/130874038/foxesemu.pdf
    • http://koalakatie.com/uploads/1/3/0/6/130621296/zanowazovo.pdf
    • http://www.vanessarusso.com/uploads/1/3/0/6/130604312/razoken.pdf
    • http://bugexhibit.com/uploads/1/3/0/4/130476452/c4ba3e3e37c.pdf
    • http://vinnitsa.live/uploads/1/3/0/3/130323110/pabub.pdf
    • http://chantelle-shaw.com/uploads/1/3/0/6/130603764/8999449.pdf
    • http://wikiemt.com/uploads/1/3/0/5/130589216/c9213217c7707c.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ea7.bin
42063c60b6538f669c5fca68e45979af5c734008f5aa68744b8b32d4b7978c4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EA7 7652 bytes

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