Malicious PDF — malware analysis report

Static analysis result for SHA-256 253a4ae3dae30823…

MALICIOUS

PDF

37.6 KB Created: 2020-03-07 20:51:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-08-25
MD5: f021334c5c0080e495260b4f8294a5a3 SHA-1: cecb8a461fca523e9d36e001cf708eb502c63d1f SHA-256: 253a4ae3dae30823f7d561c286e132507897cccd9b83e44669ed1e0cde071bc1
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains text related to 'free traceable cursive handwriting worksheets' and the authoring application 'wkhtmltopdf', suggesting a lure to disguise the malicious link farm. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves directing users to a network of linked sites, likely for SEO manipulation or to serve further malicious content.

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://nearu.com.au/uploads/1/3/0/7/130775674/130775674.html#free+traceable+cursive+handwriting+worksheets PDF link annotation
    • http://chitowngala.com/uploads/1/3/0/6/130604366/movefedibiw_sapiv_jeketixi.pdfIn PDF document text
    • http://startupwisconsin.com/uploads/1/3/0/6/130604340/8952973.pdfIn PDF document text
    • http://702291303949078184.com/uploads/1/3/0/5/130541624/7925ef7fa.pdfIn PDF document text
    • http://typo3-studio.com/uploads/1/3/0/3/130379232/dijilawemugoz_gedejejuvaj_gujulazipi_bijate.pdfIn PDF document text
    • http://traffordwoodworks.com/uploads/1/3/0/5/130543868/cb0fe7.pdfIn PDF document text
    • http://familymartialarts.co.nz/uploads/1/3/0/5/130551323/semevavufidalaruwavu.pdfIn PDF document text
    • http://platuworlds2017.com/uploads/1/3/0/6/130604923/zejek.pdfIn PDF document text
    • http://imaginecarehealth.net/uploads/1/3/0/5/130588473/1a8307490d7c5f6.pdfIn PDF document text
    • http://www.speakingofstem.com/uploads/1/3/0/5/130550874/7e0cafd5d.pdfIn PDF document text
    • http://educationalroboticsreview.com/uploads/1/3/0/4/130435715/fuvata.pdfIn PDF document text
    • http://myasianwiki.com/uploads/1/3/0/8/130813132/e59bb9e1f328.pdfIn PDF document text
    • http://yourprofessionalheadspace.com/uploads/1/3/0/6/130640114/dekiba-vafonavezebi-zitidifuw-kawuzekemoj.pdfIn PDF document text
    • http://paintandimagination.com/uploads/1/3/0/5/130551241/bukuluxaxegajulo.pdfIn PDF document text
    • http://painfulhipresurfacing.com/uploads/1/3/0/5/130590392/4907366.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6940 8320 bytes
SHA-256: 3e9e91aa3b71cc62e295432361ea590e65bd9acbef0b1bfe4268e1b3d3cfecff

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