Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9a9176f9467f8f…

MALICIOUS

PDF

42.9 KB Created: 2020-04-03 11:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 23a6361f428acbb23fba437bbb77636f SHA-1: 3d12f7ded2aa2242ce3cc9cc27c9e8bc3ccf6100 SHA-256: 4b9a9176f9467f8f28cc2978709557a9913375460b97d3986ad57ce66d2cc6c7
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to various PDF files hosted on different domains, suggesting a link farm or distribution network. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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://ecgcore.com/uploads/1/3/0/6/130639061/130639061.html#los+10+casos+de+factoreo+pdf
    • http://kensingtonclockservice.com/uploads/1/3/0/7/130775518/tizezulawo.pdf
    • http://finaltouchcleaningservices.net/uploads/1/3/0/8/130874136/3840399.pdf
    • http://probionsa.net/uploads/1/3/0/4/130483443/bbfbec.pdf
    • http://gasloandco.com/uploads/1/3/0/2/130292013/a5078d6f556c776.pdf
    • http://carnivalcraftcompany.com/uploads/1/3/0/5/130589054/2d3ef4eca375f.pdf
    • http://mssalinas.com/uploads/1/3/0/7/130740174/pesejizu-fifimut-ladowulo-bovezi.pdf
    • http://uprisingbakery.com/uploads/1/3/0/4/130476162/dujet.pdf
    • http://best-cockapoo.com/uploads/1/3/0/5/130550667/paraw.pdf
    • http://successcitypets.com/uploads/1/3/0/6/130604977/woxoremanarerosezal.pdf
    • http://oyegeneralmotors.com/uploads/1/3/0/4/130477455/beromad_xunokavipijusu_mogadad_dazuvilem.pdf
    • http://parktowncommunion.com/uploads/1/3/0/6/130639230/napugenuwitiw_gifekelupokij_kulozi.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007397.bin
7b3192b9dc0f0f76ebb7d9a7da29ca615dbbf82bb312c15a0b9eb6bd1a8d2f03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7397 9324 bytes
font_01_sfnt_off0000955f.bin
d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0x955F 2616 bytes

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