Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e19e1a5b5855ae3…

MALICIOUS

PDF

37.2 KB Created: 2020-04-18 01:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dc5a4f7e02352707296fb7bbc46fe9ab SHA-1: 170e3dff4526ca2c69110a6059bdf6aebf1f574d SHA-256: 1e19e1a5b5855ae341d791ca12c9b03b1e2cc7f4946f2a545d0204910f41ef14
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to seemingly unrelated PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to a 'sustainability report pdf' and references the wkhtmltopdf tool, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://changewhatyoubelieve.com/uploads/1/3/0/7/130739285/130739285.html#sustainability+report+pdf
    • http://childprotectionfoundation.org/uploads/1/3/1/4/131411411/nunugulogudesifupap.pdf
    • http://connectionscoffee.info/uploads/1/3/1/4/131453293/dagasuladix.pdf
    • http://anneaslin.com/uploads/1/3/0/7/130739502/nupotivivupovereg.pdf
    • http://microbialanalytics.com/uploads/1/3/0/7/130776263/97130.pdf
    • http://claytonheightsacupunctureclinic.com/uploads/1/3/0/6/130639892/bodibunolubuvok.pdf
    • http://rampartbuildingconceptsllc.com/uploads/1/3/0/6/130639862/gaxizukev.pdf
    • http://myazulwedding.com/uploads/1/3/0/2/130289161/8143172.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_off00006990.bin
3f3992cb21fa5615e447a1238ec95c5289160a25fdefe3c9e6c839fb61dba430		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6990 8212 bytes

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