Malicious PDF — malware analysis report

Static analysis result for SHA-256 dddd9e99b161a51c…

MALICIOUS

PDF

34.3 KB Created: 2020-05-14 23:45:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 22cdf3284217da59aa9bb9eb38a7248c SHA-1: 4835cab2f1a34ac4902771e70809b14b3f190b63 SHA-256: dddd9e99b161a51c8a0f75f074a94fbbadfba3fc56f25ea92afa4e7fe6d1affc
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO abuse tactic. The document body, though heavily obfuscated, contains text related to 'free rental lease agreement template south africa' and numerous URLs, indicating a lure to external content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload execution.

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://faithbiblefellowshipbaptist.com/uploads/1/3/1/1/131164350/131164350.html#free+rental+lease+agreement+template+south+africa
    • http://videolinkrc.com/uploads/1/3/0/7/130776529/vukabu.pdf
    • http://auto-aero-investments.com/uploads/1/3/0/2/130288481/0fe1b0.pdf
    • http://hbcommunitymortgage.com/uploads/1/3/0/7/130775448/wojawibirabixi_majipezezakop.pdf
    • http://yourfilmcorner.com/uploads/1/3/1/8/131856545/049f73ee15c5000.pdf
    • http://oddobrotherscpas.com/uploads/1/3/1/8/131871856/a0d967.pdf
    • http://hemofiliavida.org/uploads/1/3/0/8/130813710/sugeluxuke.pdf
    • http://moodmetals.com/uploads/1/3/0/5/130550752/46ce37.pdf
    • http://josiahdavidgathing.com/uploads/1/3/1/4/131438121/5850cd850.pdf
    • http://alsayyidah.com/uploads/1/3/0/9/130969511/2672711.pdf
    • http://ciaoagents.com/uploads/1/3/0/2/130288579/2048254.pdf
    • http://snhulearning4u.com/uploads/1/3/1/3/131381471/vupojoziguka_nupus.pdf
    • http://joyoflivingcenter.org/uploads/1/3/0/4/130488312/5475902.pdf
    • http://gratitudetravels.net/uploads/1/3/0/4/130483114/8ff64fc.pdf
    • http://nannytram.com/uploads/1/3/0/9/130969657/6455c.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_off00005aca.bin
616a66359c99011fe602114ab52a962a77fd861df51e4973c13cc273a0a3b778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5ACA 10160 bytes

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