Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0b1c5c3d62b142f…

MALICIOUS

PDF

74.3 KB Created: 2020-05-20 14:47:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc28e3efdb08578cb31935ca30022f39 SHA-1: c4919a8a1af559a949275658b88841c59c7165bd SHA-256: e0b1c5c3d62b142f9e4f9aedc75c59b6026efa5f1fdb919216f6f113d9d25d94
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document was flagged by an ML classifier as malicious. It contains a large number of external links, many of which point to other PDF files on various domains, suggesting a link farm or SEO spam tactic. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool. No scripts were extracted from this sample, but the extensive use of external links indicates a likely attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://iamcouturequeen.com/uploads/1/3/1/3/131397964/131397964.html#simbolos+astrologicos+para+word+part
    • http://smashcancerfgc.com/uploads/1/3/0/8/130874097/384345.pdf
    • http://high-rail.org/uploads/1/3/0/3/130312983/fb6753498fbd.pdf
    • http://burdentransportation.net/uploads/1/3/0/7/130775364/zizipubigap.pdf
    • http://alloneministries.net/uploads/1/3/0/3/130379063/xokevuzuzope-milezisobavuwoz-javov-mojigebareg.pdf
    • http://alexmckamie.com/uploads/1/3/0/5/130588839/2906775.pdf
    • http://unconventionalhope.org/uploads/1/3/0/5/130588513/mulumeta_nerekenuto_sumasuzuteb_zafojuliru.pdf
    • http://lineonfacebook.com/uploads/1/3/1/4/131483197/ramavog.pdf
    • http://thegangstagoddess.com/uploads/1/3/0/8/130814680/negib-vedegob-lisunumo-jozafum.pdf
    • http://centralmooloolah.com/uploads/1/3/0/6/130603850/2780019.pdf
    • http://hopehealthacademy.net/uploads/1/3/0/6/130604803/337222bba6.pdf
    • http://mummaherbssoftplay.com/uploads/1/3/1/3/131381332/gazorekotak.pdf
    • http://mcs-lawyers.com/uploads/1/3/0/6/130620998/xijokujubozusulak.pdf
    • http://tneducatorsconnect.org/uploads/1/3/0/5/130539097/2577732.pdf
    • http://mjbrendering.com/uploads/1/3/1/1/131164524/2721330.pdf
    • http://korurecruitmentnz.com/uploads/1/3/0/6/130621167/0627941c8b50e.pdf
    • http://photovideoarts.co/uploads/1/3/0/5/130588625/6278614.pdf
    • http://yournextheadquarters.com/uploads/1/3/1/3/131382531/pabipewidodikir.pdf
    • http://winstonoptical.com/uploads/1/3/0/4/130435701/4c81ce881.pdf
    • http://tryridecertain.com/uploads/1/3/0/6/130605368/1748413.pdf
    • http://anthemuas.com/uploads/1/3/0/6/130621654/7034796.pdf
    • http://thisgiftedlife.com/uploads/1/3/1/4/131453352/ralagufifekuzubavaz.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007651.bin
22e85746eefe1866d4b51e8bb45401ce7bbf161aed86a66a22273eade810dd69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7651 6908 bytes
font_01_sfnt_off00008806.bin
f8cbcfedb73e12f5129fd4dfda13effad0a3f5c6164765b0df24980f7592b13a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8806 29312 bytes
font_02_sfnt_off0000d740.bin
d19dcc739889db90218f2f97b91155bd9e0d4d5c8ceef00f96d121ceb3ed16d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD740 11204 bytes
font_03_sfnt_off0000fb9f.bin
4980d9df23906a2e6b7430120decae0ad74e4e32031a217466cef35ade7800b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 19668 bytes

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