Malicious PDF — malware analysis report

Static analysis result for SHA-256 12888278f0154991…

MALICIOUS

PDF

38.2 KB Created: 2020-03-21 11:32:43 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cb82e518e910252ac3a777d7656f2d07 SHA-1: 22ca59538a4e696148d430525bf457396c2d265b SHA-256: 12888278f0154991419ae4c04434e0250c59e02834a4577df29025b0222ae70f
136 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, with the primary URL suggesting a lure related to database cleaning. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may be instructing users to decrypt an archive, a common tactic to bypass security scanners. The presence of embedded URLs and the ML classifier's high confidence score support the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cerbro.com/uploads/1/3/0/4/130435929/130435929.html#limpiar+base+de+datos+phpmyadmin
    • http://forestgraphic.com/uploads/1/3/0/5/130551607/basakeju_tirusufo_naketo.pdf
    • http://www.drainfissure.com/uploads/1/3/0/2/130287866/c9f6b66.pdf
    • http://whatabrowants.com/uploads/1/3/0/6/130604482/xonigudaxuza-busunuxoza-wozeforelef.pdf
    • http://maracramerlpc.com/uploads/1/3/0/4/130493248/tidobotoja-zavemerawo.pdf
    • http://nwm10.club/uploads/1/3/0/7/130776812/2068317.pdf
    • http://7qk3b3.salon225.com/uploads/1/3/0/7/130776756/707801.pdf
    • http://gcditsolutions.com/uploads/1/3/0/5/130542870/repibabuziw_nuxenox_puvipulukake_nezureludizija.pdf
    • http://pitchstock.net/uploads/1/3/0/3/130323127/868d24.pdf
    • http://www.evokephotography.co.uk/uploads/1/3/0/6/130639766/d3b29.pdf
    • http://ccrewdogs.com/uploads/1/3/0/7/130776034/zeriwibo-damorum-genigijolat-ligunu.pdf
    • http://germanpinscherpuppies.com/uploads/1/3/0/6/130621584/2395604.pdf
    • http://robertjthomasphd.com/uploads/1/3/0/3/130313191/4132346.pdf
    • http://rionheart.com/uploads/1/3/0/4/130483900/xosewope.pdf
    • http://thedistrictbistro.com/uploads/1/3/0/6/130639055/824566.pdf
    • http://bensresume.com/uploads/1/3/0/7/130739621/giziroriw.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_off00006a1d.bin
bf808d98b53a0619d56fafda215b7a4c4ef90cff8bd9834d49aad973b6987506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A1D 8852 bytes

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