Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2dac69a6d31295b…

MALICIOUS

PDF

32.8 KB Created: 2020-05-25 06:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7f148d9994382e123b71138b72ec4ad SHA-1: 26b9e63ed154c2bffd93a2913bb0af5daaee4486 SHA-256: a2dac69a6d31295be9f889695448c9ad7a25f2489e8e847c3c7e6b8c1c716fac
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO poisoning technique, likely intended to drive traffic to malicious sites or host further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://wangluoqipaiyouxidaili.br3h.com/uploads/1/3/1/6/131636907/131636907.html#talktalk+powerline+adapter+no+lights
    • http://cpcalendars.provpac.com/uploads/1/3/1/4/131407836/ditilawewerugi_migeri.pdf
    • http://fitmagency.com/uploads/1/3/1/4/131455825/6902061.pdf
    • http://yourbusinesstracker.com/uploads/1/3/0/5/130539046/f341184c2de5.pdf
    • http://newholland4wdtractor.com/uploads/1/3/0/3/130313564/564044.pdf
    • http://turkanagemasycristales.com/uploads/1/3/0/4/130476699/pavadux.pdf
    • http://classes.msbrock.net/uploads/1/3/1/8/131872199/fosevijoposefes.pdf
    • http://smartlookpalakollu.com/uploads/1/3/0/6/130604200/e741de156e4b.pdf
    • http://store.campus-elite.com/uploads/1/3/0/9/130968994/nifubi-denobivalan-wegoz.pdf
    • http://socialsnapphotoboothlasvegas.com/uploads/1/3/0/7/130738882/mikazeta.pdf
    • http://taraluccievino.com/uploads/1/3/0/6/130621248/tijofas_sevomidivujok_zenukakasa_xutazopapunagi.pdf
    • http://komalatis.com/uploads/1/3/1/4/131454207/98bac0d2b8ab6.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_off00005695.bin
e1d5694b3e07560001bf69bc1c532c19f36c274d94856e33d64ce67b84b54c87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5695 9792 bytes

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