Malicious PDF — malware analysis report

Static analysis result for SHA-256 924831f49315e7af…

MALICIOUS

PDF

40.1 KB Created: 2020-03-29 09:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 20f5d5efd8396f70244a70c58f07a391 SHA-1: 8e19368559683364e33d389906afd52f21d71c46 SHA-256: 924831f49315e7afa093b9a09c2366614db88e040e32addd1d70f2dd09a8c36c
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs point to various domains, suggesting a link farm or a distribution point for further malicious content. 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://allergy.mediutopia.com/uploads/1/3/0/6/130622116/130622116.html#a+fenomenologia+de+husserl+dan+zahavi+pdf
    • http://moderncountrydoctor.ca/uploads/1/3/0/7/130739336/sodafuvatobogovujod.pdf
    • http://gardenersguru.com/uploads/1/3/0/7/130738902/bbbb8e40ddc67d.pdf
    • http://mail.dierists.de/uploads/1/3/0/6/130605124/tofukedisawi.pdf
    • http://entech-krakow.pl/uploads/1/3/0/6/130620776/luxukod.pdf
    • http://shopsilentnoise.com/uploads/1/3/0/3/130313410/mokerofikivaj.pdf
    • http://headspacetotypespace.com/uploads/1/3/0/8/130874324/9652047.pdf
    • http://unitedinfood.com/uploads/1/3/0/7/130776483/kazabopa.pdf
    • http://themac.education/uploads/1/3/0/6/130639554/8311920.pdf
    • http://socalsup.com/uploads/1/3/0/2/130272994/wemakujafufed.pdf
    • http://nationalcatholicchoir.org/uploads/1/3/0/2/130289410/nunozojegom.pdf
    • http://latoyadix.net/uploads/1/3/0/8/130874240/90ba56aa1db3e09.pdf
    • http://davidwongpanasian.acupuncturevegas.com/uploads/1/3/0/5/130588346/3b8f702.pdf
    • http://schutzengelfarm.com/uploads/1/3/0/4/130477228/xekor.pdf
    • http://rightkind.tools/uploads/1/3/0/6/130621675/1655073.pdf
    • http://pin-it-forward.com/uploads/1/3/0/2/130272485/7447790.pdf
    • http://jackiecheuvront.com/uploads/1/3/0/3/130324357/puseba.pdf
    • http://sarah-leavitt.com/uploads/1/3/1/3/131381772/tarexiwurow_genemogikadu_xidikozus.pdf
    • http://warriorkingmma.com/uploads/1/3/0/5/130551137/725816b3b5f.pdf
    • http://www.purehairincorporated.com/uploads/1/3/0/6/130639532/197483.pdf
    • http://cartersbookkeepingservices.com/uploads/1/3/0/5/130550836/8821696.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_off0000728e.bin
5b11c6282afcb408a59ca7752296fedab5b40a15102690c969c3f491d22bba00		 pdf-font-stream PDF embedded font (sfnt) at offset 0x728E 8948 bytes

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