Malicious PDF — malware analysis report

Static analysis result for SHA-256 913a16af8f4c9904…

MALICIOUS

PDF

49.8 KB Created: 2020-04-02 09:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2b8119050d95e28614e02b270773c733 SHA-1: eb5d675d6c8dea94ad3ab3e7b08e4f593f2c2ed3 SHA-256: 913a16af8f4c9904187df13871c309fc7ba4091f20ac83183061bf359c138f4a
136 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are invisible, pointing to various domains. This behavior is indicative of a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection. No scripts were extracted, but the extensive use of external links suggests a phishing or malware distribution attempt.

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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://homestagingprofessionaltraining.com/uploads/1/3/0/2/130291489/130291489.html#trabajo+social+en+grupo+y+comunidad
    • http://militaryhistorylive.com/uploads/1/3/0/8/130813779/fipadivonibex-vinezatoxoleni-jolij-famevedo.pdf
    • http://insureapplewatch.com/uploads/1/3/0/5/130550936/fa5b7cda70e3c2.pdf
    • http://hostmaster.wassa-bergmann.de/uploads/1/3/1/1/131164054/4443774.pdf
    • http://stand4kindness.org/uploads/1/3/0/5/130551249/6223404.pdf
    • http://ianosventures.com/uploads/1/3/0/9/130969496/wukiwopajowoto.pdf
    • http://securingcenter.com/uploads/1/3/1/1/131163718/8825560.pdf
    • http://micheleyoung.net/uploads/1/3/0/7/130776743/luvugekavibofadalevi.pdf
    • http://server0-secure-1portal.online/uploads/1/3/1/3/131398134/15536274c.pdf
    • http://thecottonlickers.com/uploads/1/3/1/0/131069808/350cd5b38c.pdf
    • http://informstamu.com/uploads/1/3/0/5/130588786/vabezi_jomujukorum_xexogekapefabi_gekojufumesos.pdf
    • http://vintagenowus.com/uploads/1/3/0/9/130968985/duwidekifadiva-rifige-bedes.pdf
    • http://drdeborahbarbiere.com/uploads/1/3/0/6/130620798/3151364.pdf
    • http://mecadmecanismosyaditamentos.com/uploads/1/3/0/8/130873828/nopugenorofemofapavu.pdf
    • http://preeminentglobalofdcllc.com/uploads/1/3/0/4/130488123/ratek_rozusimog_nesexovoxapo.pdf
    • http://tenantrep2017.com/uploads/1/3/1/4/131453432/5252815.pdf
    • http://bharatmatta.com/uploads/1/3/1/0/131070168/4687102.pdf
    • http://movethemortgage.com/uploads/1/3/0/6/130640029/061cf456e.pdf
    • http://benevolentheartyoga.com/uploads/1/3/0/6/130604805/lelulim_neberobop.pdf
    • http://afewupliftingwords.com/uploads/1/3/0/5/130543256/2085981.pdf
    • http://dazcroghan.com/uploads/1/3/0/7/130776655/9dcf04bab42.pdf
    • http://jaydeleski.sucks/uploads/1/3/1/0/131070204/jebigerudapori.pdf
    • http://kirraneplanthire.com/uploads/1/3/0/2/130272554/gaset-kimezosub-kenatol-daxefinin.pdf
    • http://womenhomi.com/uploads/1/3/0/6/130621238/b5faede566d.pdf
    • http://ecosanexcleaning.com/uploads/1/3/0/6/130604759/bifesilogodero-munixubemedixib-safatasixu-redojafus.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_off000098f6.bin
d1da8dc481a6c3c18bf6cd20ef1f74ac4ad499f3e4788c52d6aefc4b88b145d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98F6 8524 bytes

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