Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc337ea9b28107e…

MALICIOUS

PDF

51.6 KB Created: 2020-04-14 15:01:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ce52a6792abe7d3381c076ab39976659 SHA-1: 41cb4f71ac6d1362e6794213a861deff846fe925 SHA-256: ebc337ea9b28107e593c63d0fb627f5a3fc1f80d4af3c1e2429f13b5e9f5526c
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to PDF files on various domains, indicating a link farm strategy. The ML classifier strongly flagged this PDF as malicious. The embedded document body text mentions 'Crystal reports 13.0.23' and 'wkhtmltopdf', suggesting a lure to download or access this software, which is likely a pretext for malicious activity.

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://grimmon.com/uploads/1/3/0/3/130323599/130323599.html#crystal+reports+13.+0.+23
    • http://stunningpapillonpuppies.com/uploads/1/3/1/4/131453429/1908940.pdf
    • http://naturesportraitsbybeth.com/uploads/1/3/0/7/130739970/50523c72eb72.pdf
    • http://shawdevelopmentshoppingcenters.com/uploads/1/3/0/9/130969375/6d496a30b4e1b.pdf
    • http://clearwaterguttercleaners.com/uploads/1/3/1/0/131071072/d90f8af69ad6.pdf
    • http://eaglecreekpropertiesllc.com/uploads/1/3/0/7/130775373/likilisize.pdf
    • http://alumograph.com/uploads/1/3/0/5/130551659/2960120.pdf
    • http://ngsports.net/uploads/1/3/0/6/130604919/gadow_sarigodobaj_tefamek_kebepasaxek.pdf
    • http://seminariosmetodoyuen.com/uploads/1/3/0/4/130483872/xedapevovepevopawizo.pdf
    • http://kindkvist.com/uploads/1/3/0/4/130476413/zudupitag.pdf
    • http://mytrumpvsobamaeconomics.com/uploads/1/3/0/4/130488773/nuvizopefanu-wisunupob.pdf
    • http://catsummitbhm.org/uploads/1/3/0/9/130970014/sutoragip.pdf
    • http://andreassweetshoppe.com/uploads/1/3/1/0/131070998/6432123.pdf
    • http://martyking.net/uploads/1/3/0/7/130776474/3791163.pdf
    • http://thatfeministjew.com/uploads/1/3/0/4/130491757/3188520.pdf
    • http://chimyst.com/uploads/1/3/0/2/130274091/meposagimapovumeruku.pdf
    • http://clearwaterguttercleaner
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000085cb.bin
99e104d881e85dd31718dace8b3ebe3ea0ca01558962fb90b92a97506160e770
pdf-font-stream PDF embedded font (sfnt) at offset 0x85CB 6480 bytes
font_01_sfnt_off00009595.bin
5ef62a162eca793341f12353a2b58cebf354fa0ae373446977c6cbc99b2a3307
pdf-font-stream PDF embedded font (sfnt) at offset 0x9595 8636 bytes
font_02_sfnt_off0000b67d.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea
pdf-font-stream PDF embedded font (sfnt) at offset 0xB67D 2652 bytes