Malicious PDF — malware analysis report

Static analysis result for SHA-256 453ade1ed0a1ee2b…

MALICIOUS

PDF

36.4 KB Created: 2020-03-25 09:51:48 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e601c4c7b101bd7f0c9e696da8b6a170 SHA-1: 1a6e98305e95a2425f8355e37824829031792e68 SHA-256: 453ade1ed0a1ee2ba9f4134ccb636866c0b9449b732a4f67f90427f23a191675
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs on various domains. The document body, though partially corrupted, includes text related to educational programs and the wkhtmltopdf tool, suggesting a lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, likely for SEO manipulation or to host malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://hepburnhideaway.com/uploads/1/3/0/5/130589064/130589064.html#programa+de+estudios+2011+secundaria+espa%C3%B1ol+sep
    • http://theworldinmybackpack.com/uploads/1/3/0/3/130313588/21824707efb1838.pdf
    • http://thinkdoodletalk.com/uploads/1/3/0/5/130543868/kujaf-kejajiduvedofu-kejubamusajiwep.pdf
    • http://forestparkyoga.com/uploads/1/3/0/5/130538946/8d8616d7f4106cb.pdf
    • http://gpathletes.com/uploads/1/3/0/4/130435763/mudotajadanida.pdf
    • http://www.tessaclaire.com/uploads/1/3/0/6/130621812/4208318.pdf
    • http://lunaparkstudio.net/uploads/1/3/0/7/130739564/5448249.pdf
    • http://hotelfindercity.com/uploads/1/3/0/4/130476821/6bb33.pdf
    • http://architechart.com/uploads/1/3/0/5/130542964/3881081.pdf
    • http://alpinecbd.co/uploads/1/3/0/4/130436154/1384a3c.pdf
    • http://www.mobilityfamily.com/uploads/1/3/0/7/130740443/zimasazubasidil.pdf
    • http://warwickcarriagedriving.com/uploads/1/3/0/4/130483537/7e4ba8b.pdf
    • http://mail.ayumikuramae.com/uploads/1/3/0/8/130814241/vofilopafi-satumimome-pugabimed.pdf
    • http://socialmarketing.co/uploads/1/3/0/7/130738712/58bd4c7803db.pdf
    • http://creepyfuckingstalker.com/uploads/1/3/0/3/130323141/7951446.pdf
    • http://kmmaintenance.org/uploads/1/3/0/2/130272092/wimobetovu-kagofo.pdf
    • http://novembereleven.net/uploads/1/3/0/2/130272976/2127642.pdf
    • http://milecreekfarmsixmilesc.com/uploads/1/3/0/6/130603676/7560903.pdf
    • http://mta-sts.mail.mcalearmanagement.com/uploads/1/3/0/6/130639613/cf051300b.pdf
    • http://emutrekkers.com/uploads/1/3/0/6/130620644/tezetu_kufagutoribut_sepopeme.pdf
    • http://mychtonline.com/uploads/1/3/0/5/130589339/mixolojonibi.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_off000063d3.bin
5b5bed0a7e6f3c63f23550fb004f3c2b2bce1af1547352f80ea29071a74884a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 8256 bytes