Malicious PDF — malware analysis report

Static analysis result for SHA-256 5424454a3ce56b30…

MALICIOUS

PDF

35.6 KB Created: 2020-05-02 14:07:12 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f4cad462272a405a4ba659d4fd4b84c9 SHA-1: bc37e8db654aacc21343e84550421faa5877bf11 SHA-256: 5424454a3ce56b301b5117ab3163772cbcb0bb0e1f6b0e84c16404a930c0cc3c
94 Risk Score

Malware Insights

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

The PDF contains numerous external links to other PDFs hosted on various domains, indicative of a link farm or SEO spam campaign. The ML classifier strongly flagged this PDF as malicious. The document body, though partially corrupted, contains text related to 'sketching derivative graphs worksheet with answers' and mentions wkhtmltopdf, suggesting a lure to educational content that redirects to malicious sites.

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://avidaenglish.com/uploads/1/3/1/4/131438313/131438313.html#sketching+derivative+graphs+worksheet+with+answers
    • http://equalprotection.net/uploads/1/3/0/8/130874610/225ee52d6db.pdf
    • http://westendbarbershop.com/uploads/1/3/0/2/130272978/patojuxizukofuxu.pdf
    • http://bigislandweekend.com/uploads/1/3/1/3/131379168/losise_mubufin_vuribukuw_tukivataxewukef.pdf
    • http://homescomingsoonindublinranch.com/uploads/1/3/0/5/130539218/fbfa19.pdf
    • http://hamakuainspectors.com/uploads/1/3/0/5/130538941/7567805.pdf
    • http://blkaceau.com/uploads/1/3/1/3/131383624/mamif.pdf
    • http://platuworlds2017.com/uploads/1/3/1/6/131606020/284830.pdf
    • http://dirtylittletruckers.com/uploads/1/3/0/8/130813539/36768ec.pdf
    • http://greenhillwinery.info/uploads/1/3/1/4/131452880/92991443.pdf
    • http://hamakuainspectors.com/uploads/1/3/0/5/130538941/7567805
    • 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_off0000625e.bin
872cdfb1157620d8137ea3cb31450ecd56e345a771b8143f849087bd3d3bae11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x625E 7744 bytes

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