Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d41e7b2291c8b93…

MALICIOUS

PDF

38.4 KB Created: 2020-04-25 05:43:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7a8920a000230789572f44664dde2d94 SHA-1: 3978a95f3ed0f286d4f84fff791bcbdde3811ec3 SHA-256: 0d41e7b2291c8b9345261ce5f588aa07d37a4a2f4db8f26d082d5bd4bd8cc128
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or distributing malicious content. The embedded URL 'http://veselamugura.lv/uploads/1/3/0/4/130476496/130476496.html#abbyy+finereader+14+full+version+free' suggests a lure for downloading software. The ML classifier strongly indicated maliciousness, supporting the link farm heuristic.

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://veselamugura.lv/uploads/1/3/0/4/130476496/130476496.html#abbyy+finereader+14+full+version+free
    • http://williamlauto.com/uploads/1/3/0/3/130379146/wuputugotiked-wakasosaridume-felebig-girunu.pdf
    • http://moisescastro.com/uploads/1/3/0/7/130774973/8a6975fe.pdf
    • http://smarthealthactivator.com/uploads/1/3/1/4/131407414/91adf9320058f.pdf
    • http://saveourveterans.org/uploads/1/3/1/4/131484029/somewivigilosu.pdf
    • http://summerclarinetcamp.com/uploads/1/3/0/5/130588357/pamepoxebofegosurote.pdf
    • http://bubblebagsaustralia.com/uploads/1/3/0/2/130271229/rupalanemedole.pdf
    • http://performancemedicalsolutions.com/uploads/1/3/0/3/130313221/tafodajotiv.pdf
    • http://forelisafashion.com/uploads/1/3/0/5/130550967/wowavetu-kuwiviri-fimawefudemuke-zowojidawozupak.pdf
    • http://williamyasnoff.com/uploads/1/3/0/7/130775355/gedobepijixox.pdf
    • http://learnonlinefast.com/uploads/1/3/0/7/130739163/tenokefemo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063c6.bin
7de3a2b4e8bb10b406fe5264878ec3b90a10c652d4ff81813de70800620ade5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63C6 7792 bytes
font_01_sfnt_off0000821e.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x821E 2652 bytes

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