Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbdd296c5e6baf2…

MALICIOUS

PDF

34.9 KB Created: 2020-05-25 03:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6f089802cfc0b4a6481d4c4f46fb5ef SHA-1: 18e3a90707ad7d34f08c4f1916d126fc91ba9a44 SHA-256: bbbdd296c5e6baf2580d3afb3a2be1f6bcfb17bc13dae62ef8227be8ba07df3e
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to various domains, a technique often used for SEO poisoning or to distribute further malicious content. The ML classifier strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dmcauto.org/uploads/1/3/0/6/130621384/130621384.html#masal+kitab%25C4%25B1+indir
    • http://tinbabv.com/uploads/1/3/0/6/130621555/7618865.pdf
    • http://mta-sts.mail.theshapesmithbrisbane.com/uploads/1/3/0/6/130621261/pirotib.pdf
    • http://summitatallsaints.com/uploads/1/3/1/8/131856125/97a00e.pdf
    • http://dronetrout.com/uploads/1/3/1/4/131483275/tonijevilet_vewedofiwaj.pdf
    • http://alloexo.org/uploads/1/3/0/5/130551700/139e83.pdf
    • http://socialcomedynetwork.com/uploads/1/3/1/4/131409236/lonog.pdf
    • http://consultwithcjl.com/uploads/1/3/0/5/130589202/fomenogopet_vegaf_fopawalu_bujelukuwiz.pdf
    • http://patshatsbypatricia.com/uploads/1/3/1/6/131606111/6402858.pdf
    • http://hanffstudios.com/uploads/1/3/0/7/130739537/nijub.pdf
    • http://kwildphoto.com/uploads/1/3/0/7/130776502/soxiwesum.pdf
    • http://gigodata.com/uploads/1/3/0/3/130379435/jekowowopomupod.pdf
    • http://bookingbeauty.net/uploads/1/3/0/2/130289427/927707.pdf
    • http://danieldifranco.net/uploads/1/3/1/4/131408092/4360480.pdf
    • http://bunniesareus.com/uploads/1/3/0/4/130488414/4264122.pdf
    • http://leahrachellekendrick.com/uploads/1/3/1/3/131384432/pupar_nufefijidubizez.pdf
    • http://lizetalba.com/uploads/1/3/1/0/131069923/1875582.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_off00005be1.bin
0b9a8aa80774fb4691cb1c118561d133a20aa6e90907c16376d7c1c7c5130fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE1 11188 bytes

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