Malicious PDF — malware analysis report

Static analysis result for SHA-256 7760c0863b362400…

MALICIOUS

PDF

62.4 KB Created: 2020-03-15 01:22:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9ab9e5438996ba97dca557440567d6a2 SHA-1: 6f7cc6d0efd24a55fa840bad3ad432957eb1ec7b SHA-256: 7760c0863b3624003d922d517e833bb4596abcef9505a858efb81a826fa38efb
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which are numerically or generically named PDFs, suggesting a link farm designed to host malicious content. The document body, though partially obfuscated, contains text that appears to be a syllabus and includes a prominent URL, indicating a lure to download further content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://officer.mediutopia.com/uploads/1/3/1/0/131070776/131070776.html#bteup+syllabus+2019-+20+pdf
    • http://skynetinternational.org/uploads/1/3/0/8/130874241/reximasix-wusum-juzul-ledijaxej.pdf
    • http://gr8bonus.com/uploads/1/3/0/6/130639052/7419987.pdf
    • http://barsportpobla.com/uploads/1/3/0/6/130604011/wuruzuf.pdf
    • http://www.sayitwithaparty.com/uploads/1/3/0/6/130621299/jamotetakakumetezi.pdf
    • http://mathemonads.com/uploads/1/3/0/2/130291640/4290a4d5.pdf
    • http://puppyluproductions.com/uploads/1/3/0/3/130313345/besimuzenobuj.pdf
    • http://mastient.com/uploads/1/3/0/3/130313005/2644090.pdf
    • http://kcdermodywriter.com/uploads/1/3/0/5/130539270/1fae37524dc8ff.pdf
    • http://velocityproxies.com/uploads/1/3/0/7/130739778/8517345.pdf
    • http://otterycommunitytheatre.co.uk/uploads/1/3/0/2/130287291/8502855.pdf
    • http://energyfortheuniverse.com/uploads/1/3/0/2/130272477/ferowit.pdf
    • http://reliantdiversifiedservices.com/uploads/1/3/0/8/130814017/7600793.pdf
    • http://mrsroe.com/uploads/1/3/0/7/130739028/eb608.pdf
    • http://www.rjfitnessokc.com/uploads/1/3/0/5/130545194/wopuxupebixuvawefu.pdf
    • http://davidkhem.com/uploads/1/3/0/6/130604905/kefajojinisusujewi.pdf
    • http://nyanyakrasnoyarsk.ru/uploads/1/3/0/2/130289296/zivule.pdf
    • http://www.reallyauthentic.com/uploads/1/3/0/6/130621477/c0125763022e.pdf
    • http://americanbeachphoto.com/uploads/1/3/0/4/130483325/getumezunezevow.pdf
    • http://bidclues.com/uploads/1/3/0/7/130739237/renekuxevi.pdf
    • http://morsebrass1.com/uploads/1/3/0/5/130588674/60bd867.pdf
    • http://pittsburghboychoir.com/uploads/1/3/0/7/130739147/bd103fffe4.pdf
    • http://enscarved.com/uploads/1/3/0/6/130620168/zupameva.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a97d.bin
670a174704e8fe1fcbc4e16c250ce2cff7b2197e2f6bcba3b1e1ed64cf31ae49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA97D 8076 bytes
font_01_sfnt_off0000c89a.bin
74d0d47a38a4ad9bbfba3f82a69d3de538cf4e0cbf01274597f0df87f486ee42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC89A 12132 bytes

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