Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2de3dbee3a8ac48…

MALICIOUS

PDF

47.8 KB Created: 2020-04-26 22:06:35 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1313da13b3313c815a2223fb7d726c87 SHA-1: 1c06ebf4ac9c34cf5e74f88f5b5b9dc701ce114f SHA-256: b2de3dbee3a8ac48234ce3638151c8b0f33c865c54906d209af3ca23583393bb
94 Risk Score

Malware Insights

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

The PDF contains a large farm of external links, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body text is heavily garbled but contains a URL that matches one of the extracted links, suggesting it's the primary lure.

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://ocularcentro.com/uploads/1/3/0/6/130605173/130605173.html#browser.+.+manager.+showwhenstarting+not+working
    • http://nanelyn.com/uploads/1/3/1/0/131071035/fuxipopewabijoki.pdf
    • http://lifebadger.net/uploads/1/3/0/2/130289021/545af08cf6fe8b.pdf
    • http://moonshot.games/uploads/1/3/1/4/131453146/vorivunejul.pdf
    • http://makingmusiconenoteatatime.com/uploads/1/3/1/3/131379392/sivogilasiwozaj-fuvaketes-bifamubexani-zotunujupo.pdf
    • http://vendorsplazastt.com/uploads/1/3/1/3/131383770/4047793.pdf
    • http://tacoboutus.org/uploads/1/3/0/9/130969439/f8c1a94.pdf
    • http://theoldcaravan.com/uploads/1/3/0/6/130620224/6216721.pdf
    • http://produccionesbigsbranding.com/uploads/1/3/0/8/130874060/c90e65bef5e.pdf
    • http://fatgrandmadips.com/uploads/1/3/0/2/130272241/1086620.pdf
    • http://businessrecords.net/uploads/1/3/0/7/130775731/mevikulenomuwomib.pdf
    • http://smartchoiceagentsia.com/uploads/1/3/0/7/130776460/b81c066c179d0.pdf
    • http://delvelegalnurseconsulting.com/uploads/1/3/0/6/130639396/9e26f96bcd.pdf
    • http://flyingbeauty.ch/uploads/1/3/0/8/130873738/ragupobeparotujewifo.pdf
    • http://pats-food-shack.com/uploads/1/3/0/3/130313577/8571745.pdf
    • http://sowadang.net/uploads/1/3/0/8/130873915/d1df80ebd33b819.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_off0000906f.bin
185e4947ab7e71208ac342da1e04782be92b420d29315fefeea81dd4bc96b258		 pdf-font-stream PDF embedded font (sfnt) at offset 0x906F 9184 bytes

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