Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a6a257116a8b057…

MALICIOUS

PDF

40.0 KB Created: 2020-05-13 17:33:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 6cfa63e4e8a3da676f6f284811c84e9c SHA-1: bd02c4ca983564345f4caa81eda4d57aa8653c79 SHA-256: 5a6a257116a8b05734f9fd1ffbc0cd66fc993d3cbf7f53b99c5318d69167fd70
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or redirect users to potentially malicious sites. The ML classifier strongly indicated maliciousness, and the PDF structure itself contains numerous external URIs. While no scripts were extracted, the sheer volume of outbound links points towards a malicious intent, likely related to SEO spam or hosting 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://baylandesign.net/uploads/1/3/0/6/130604034/130604034.html#math+tip+worksheet+answer+key
    • http://eastuniversityplace.com/uploads/1/3/1/6/131636719/fepomositir.pdf
    • http://surfcityfitclub.com/uploads/1/3/0/8/130813307/lobifumubajubewapenu.pdf
    • http://getgavel.com/uploads/1/3/0/5/130539325/6215583.pdf
    • http://antmacgroup.com/uploads/1/3/1/3/131381819/ripenuwox.pdf
    • http://inkabhp.com/uploads/1/3/0/4/130488157/8457793.pdf
    • http://541914970615544338.com/uploads/1/3/0/2/130289363/3645446.pdf
    • http://thehousebeneaththesea.com/uploads/1/3/0/7/130775949/428427.pdf
    • http://happyishlife.com/uploads/1/3/0/8/130813956/2297890.pdf
    • http://mattressminiwarehouse.com/uploads/1/3/0/6/130620427/pejejibudosexedaxon.pdf
    • http://boxcarpics.com/uploads/1/3/0/5/130545194/dc75050f104eebc.pdf
    • http://nifesolar.com/uploads/1/3/1/4/131438098/dajevup_fakonigijama_gebufibixiz.pdf
    • http://andrewgangidine.com/uploads/1/3/0/5/130545382/lovapazu.pdf
    • http://narcanna.org/uploads/1/3/0/3/130312965/dogurok.pdf
    • http://jamietullisportfolio.com/uploads/1/3/0/5/130590608/dowiger.pdf
    • http://boringsidney.com/uploads/1/3/0/6/130621211/lasadirifireba_zexeji_nawanefi_lizaxugug.pdf
    • http://lakelandculturalartscenter.com/uploads/1/3/1/0/131070843/1fc63.pdf
    • http://bicanthropy.com/uploads/1/3/1/4/131406950/9351097.pdf
    • http://transportfi.com/uploads/1/3/1/6/131637529/4389937.pdf
    • http://tucsoninabox.com/uploads/1/3/0/5/130588332/tisimotax_jefevapojaz_butomerotunanej_nagosoko.pdf
    • http://idrottsalliansen.se/uploads/1/3/1/1/131164452/gexujef.pdf
    • http://vigilantprey.org/uploads/1/3/1/6/131636726/e31272.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_off00006d54.bin
9da9dea48c48e6a4dd0a268b8f690499728c29c0acc8e0d13979972477f308e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D54 10776 bytes

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