Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa9f353cb1e1631…

MALICIOUS

PDF

36.3 KB Created: 2020-03-21 02:08:37 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fb54628934a34e1e926152c658d2028e SHA-1: 8f14788be0ecada33a8aa9908750ac7b30c68296 SHA-256: 4fa9f353cb1e16316a504db5f520071d70005aa9d22aaf513ccfb8ef8c540e01
94 Risk Score

Malware Insights

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

The PDF document 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 contains garbled text but also includes the URL http://simplynature-fineartphotography.com/uploads/1/3/0/2/130270987/130270987.html#interpretacion+mmpi+2+escalas, which is one of many similar URLs pointing to PDF files hosted on various domains. This suggests a link-farming or redirection scheme.

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://simplynature-fineartphotography.com/uploads/1/3/0/2/130270987/130270987.html#interpretacion+mmpi+2+escalas
    • http://mta-sts.mail.taosabi.com/uploads/1/3/0/7/130775782/5573870.pdf
    • http://www.bootslikemine.com/uploads/1/3/0/7/130776749/6511268.pdf
    • http://midlandscustomapplicators.com/uploads/1/3/0/7/130776166/rawifekojadorel_sowurivazuvuf_rajopokarorawe_tozifilijupo.pdf
    • http://tranqill.com/uploads/1/3/0/4/130483993/kekatas-xugiv.pdf
    • http://novasparockyhill.net/uploads/1/3/0/2/130289172/0a7bde.pdf
    • http://naileditnorthshore.com/uploads/1/3/0/7/130739879/jesixudijizip-mazirofumavu.pdf
    • http://doorandwindowplus.com/uploads/1/3/0/4/130483895/ruxusube.pdf
    • http://andrzejciborski.com/uploads/1/3/0/7/130739027/jofine.pdf
    • http://homeopathic-health-care.com/uploads/1/3/0/7/130739982/pimukulejinoliba.pdf
    • http://noahcompportfolio.com/uploads/1/3/0/4/130483118/xojinezaserusa.pdf
    • http://feine-stoffe-koeln.de/uploads/1/3/0/6/130604244/8109426.pdf
    • http://teaminspirethefire.net/uploads/1/3/0/6/130621273/6727454.pdf
    • http://babyboomerscafe.net/uploads/1/3/0/4/130476342/biraxonozugavu.pdf
    • http://fhs-pto.com/uploads/1/3/0/5/130539728/mapiramoritutuzepizi.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_off000065ba.bin
c992fe6fd41e3d79c0c487b1710888856ebcdcdd3cec1a0cb695e37d0ecf3c54		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65BA 8388 bytes

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