Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aac2648c526b33a…

MALICIOUS

PDF

62.8 KB Created: 2020-05-04 09:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e2396ff1eeb320582d126ca388fa277d SHA-1: 2e78451246001c0323da1473b1a139ad79ae3214 SHA-256: 5aac2648c526b33aef0bdf8023d38cac9aee44e6d6c17c6514be7699deaa13f7
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are numerically or generically named PDFs, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs points towards an attempt to redirect users to potentially malicious content. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://rekazconsult.com/uploads/1/3/0/7/130739628/130739628.html#natural+love+birds+images
    • http://udomyte-corporation.com/uploads/1/3/0/3/130379118/4e6b961b6f7a36.pdf
    • http://winsomebirths.com/uploads/1/3/0/6/130603838/nifurititasepebufemi.pdf
    • http://nanelyn.com/uploads/1/3/0/6/130620796/rujakano.pdf
    • http://apiecefulhome.com/uploads/1/3/0/3/130323908/8684303.pdf
    • http://porchlightapothecary.net/uploads/1/3/1/0/131070098/3527527.pdf
    • http://five2flourish.com/uploads/1/3/0/5/130550867/xukovavifema.pdf
    • http://gurveshkaur.com/uploads/1/3/1/8/131872137/nuwab.pdf
    • http://lycon.com/uploads/1/3/1/4/131453847/c07159eb066df.pdf
    • http://mileskeever.com/uploads/1/3/0/7/130775085/wudupa.pdf
    • http://voltinovations.com/uploads/1/3/0/9/130969436/nixoxi.pdf
    • http://kciafardone.com/uploads/1/3/0/7/130776142/xidegawuvirapox.pdf
    • http://aneeqarana.com/uploads/1/3/0/6/130639178/886b06141f1c.pdf
    • http://treasures4yourheart.com/uploads/1/3/1/3/131398234/9523920.pdf
    • http://offdatop.com/uploads/1/3/1/4/131406291/6620ecad2f0395f.pdf
    • http://whodidifuck.com/uploads/1/3/1/4/131453624/7545418.pdf
    • http://aoscfdallas.org/uploads/1/3/0/6/130621004/nosuwosefine-juxejip.pdf
    • http://wordsmithandwesson.com/uploads/1/3/0/8/130813999/remotitet.pdf
    • http://cbdeez.org/uploads/1/3/0/6/130620659/feduzefarig-gudaborofotaf-safogo-ridajodeviriw.pdf
    • http://landscapingschaumburgil.com/uploads/1/3/0/5/130538981/polagikokebodafe.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/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_off0000c55a.bin
2850a5bcf554c5d6d9eb86f6cd5652e4ba09552b4e206e3ff9aafb4cc21b5f5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC55A 13220 bytes

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