Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6225033970672f1…

MALICIOUS

PDF

42.4 KB Created: 2020-03-31 05:36:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e20c0d136540a1e94315511daa6d8b4f SHA-1: 859c93b2c959b1399ec38ecb6ce561b2ed80248d SHA-256: d6225033970672f1de32b46cbbe1384ac5de10d4d2dc282038d3c8fc8fc8b4a6
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 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 part of this link farm. The primary purpose appears to be directing users to a multitude of other PDF documents hosted across various domains, likely for SEO manipulation or to distribute 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://yourchairmansclub.us/uploads/1/3/1/0/131071249/131071249.html#aerosoft+pmdg+737+ngx
    • http://laurellakesdentist.net/uploads/1/3/0/6/130604509/tofopozopoxom.pdf
    • http://bookshrinkediting.com/uploads/1/3/0/6/130620594/xujek-fewaririmivube.pdf
    • http://flyingzkennels.com/uploads/1/3/0/7/130776078/vulevomilu-korifawan-rexudosowasupe-ruvumotakagi.pdf
    • http://socialskillsamerica.org/uploads/1/3/0/6/130639739/94e3ce8dd2.pdf
    • http://solarmercury.com/uploads/1/3/0/5/130589000/1117369.pdf
    • http://propagandaculture.com/uploads/1/3/0/6/130639294/309004d041551.pdf
    • http://titleservicenv.com/uploads/1/3/1/1/131164054/resowu-dipukelifopije.pdf
    • http://makeitworkwellness.com/uploads/1/3/0/6/130604594/rigotalifoka_vazotabil_lukibu_judobedefete.pdf
    • http://sunnypropertyinspections.com/uploads/1/3/1/0/131070508/8935361.pdf
    • http://aspenvalleywildlifesanctuary.ca/uploads/1/3/0/7/130776718/37e06.pdf
    • http://chandra-biermann.com/uploads/1/3/0/5/130543383/zibuvopovigazunadaw.pdf
    • http://kylpinc.org/uploads/1/3/0/8/130813330/guxugobukepus_xivezosiral.pdf
    • http://homicidalmarketing.com/uploads/1/3/0/4/130476733/vukatafus_gazukeja.pdf
    • http://billshandymanservice.net/uploads/1/3/0/5/130588763/fediwa.pdf
    • http://ginkgoliving.net/uploads/1/3/1/0/131071262/xixozenelafizoda.pdf
    • http://hipcontracting.com/uploads/1/3/0/9/130969999/masowula.pdf
    • http://clinicaderehabilitacion.net/uploads/1/3/0/2/130289629/lilorakatamuruze.pdf
    • http://movebox.nl/uploads/1/3/0/6/130620818/tuzekupeje_gezubaxukis.pdf
    • http://dankerie.org/uploads/1/3/0/5/130551429/4f688878ed8fdf9.pdf
    • http://rhiagowen.net/uploads/1/3/0/2/130289813/zifuzo-zavat.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_off00007cbc.bin
1ceb55a71822ee05e1eed1b99bd3d7d783c53581014e2320099904c1b3708d0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CBC 8488 bytes

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