Malicious PDF — malware analysis report

Static analysis result for SHA-256 da78df267e81e097…

MALICIOUS

PDF

33.3 KB Created: 2020-03-10 03:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e9256961f0895712c210daf759a07971 SHA-1: bdf2441ca348c1f57877e38fb3262130dcb731c0 SHA-256: da78df267e81e097fe8a9011a0402766cddc4027ef7e0a34d27f73b1341bf688
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or redirection strategy. The ML classifier strongly flagged this PDF as malicious. The document body text is largely unreadable due to encoding issues but contains a reference to 'English test b1 grammar pdf' and the authoring application 'wkhtmltopdf', suggesting a potential lure or content obfuscation. The primary attack pattern involves directing users to a multitude of external resources.

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://w6jsx.bpmtc.com/uploads/1/3/1/0/131070298/131070298.html#english+test+b1+grammar+pdf
    • http://auradayspasalon.com/uploads/1/3/0/6/130640021/5f42265036bc5d.pdf
    • http://blueprintgeeks.com.au/uploads/1/3/0/6/130604225/171570433efd89.pdf
    • http://mail.deeardelean.com/uploads/1/3/0/7/130774972/sujegax.pdf
    • http://www.alldogsaresmart.info/uploads/1/3/0/9/130969999/e7070.pdf
    • http://hostmaster.scuc.co.uk/uploads/1/3/0/2/130272928/xofobirujuv-setagadovodev-zivujisowuvuwi-musar.pdf
    • http://unitedinfood.com/uploads/1/3/0/6/130639733/2550883.pdf
    • http://worldwineweek.com/uploads/1/3/0/8/130874272/jigewisab.pdf
    • http://blueware.co.uk/uploads/1/3/0/6/130621509/vewidob.pdf
    • http://bretlynscreations.com/uploads/1/3/0/4/130435524/sodulotuzi-wavuwufir.pdf
    • http://taichi.services/uploads/1/3/0/3/130313433/wotesotumad.pdf
    • http://www.alisterassets.com/uploads/1/3/0/4/130478374/tebojilut_benumoku.pdf
    • http://chrissyanncollection.com/uploads/1/3/0/6/130620976/zupenujepagaxuri.pdf
    • http://cc0motiongrahpics.com/uploads/1/3/0/5/130588515/407425.pdf
    • http://dazzligner.com/uploads/1/3/0/4/130490006/5443201.pdf
    • http://thekartelnetwork.online/uploads/1/3/0/2/130274291/9834746.pdf
    • http://solorealestatecorp.com/uploads/1/3/0/4/130483973/rafexobir_lidutavabub_nukomejo_paveram.pdf
    • http://palmgrouphome.com/uploads/1/3/0/6/130639270/nufepipenadulo-futumowoxe.pdf
    • http://theeightoneseven.com/uploads/1/3/0/7/130739615/zakepobijivowop_ziwizakuxebub_borovux_pixulazel.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_off00005c75.bin
77401090362911ca2823868d2d9a2be34c163546680c3685c3896a1f3bd27ca6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C75 6928 bytes

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