Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e629b7963fa02e…

MALICIOUS

PDF

58.0 KB Created: 2020-03-20 07:57:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0c0d07dd3722cc4c5807a1c75c34d2a1 SHA-1: e00373ae2a88e4bc364fd3c8be504801aa5402b2 SHA-256: 84e629b7963fa02e057de9decef0516f87cbabe88e4236d97d701b54648b48a6
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are dynamically generated and point to suspicious domains. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern appears to be a link farm designed to redirect users to potentially harmful websites.

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://1842barranca.com/uploads/1/3/0/6/130621413/130621413.html#historia+y+estructura+del+adn+y+arn+transcripcion
    • http://strangebrau.com/uploads/1/3/0/6/130605393/jojim.pdf
    • http://artofcannabiz.com/uploads/1/3/0/2/130289279/jagafepogibem_bokev_lirer_lajavowef.pdf
    • http://narayanahotelandresidences.com/uploads/1/3/0/6/130622076/zinikenoxifizoperu.pdf
    • http://www.wecaremi.com/uploads/1/3/0/6/130605314/bejugijozije-bajow-zovijinizel.pdf
    • http://empresamorenodrywallsteelframing.net/uploads/1/3/0/3/130312929/xexetopafugizezi.pdf
    • http://trainingcenterchurches.com/uploads/1/3/0/5/130550713/3443254.pdf
    • http://www.whippoorwillfarmcsa.com/uploads/1/3/0/4/130476859/kinewozojeges-netumesa.pdf
    • http://www.mosquitomiracle.com/uploads/1/3/0/7/130775572/piveji.pdf
    • http://mail.projecthealthycommunity.org/uploads/1/3/0/8/130874384/952b40093d.pdf
    • http://scireinke.com/uploads/1/3/0/5/130546237/topewavezux.pdf
    • http://www.gwhsgbesi.com/uploads/1/3/0/6/130620719/5406272.pdf
    • http://nowbiz.net/uploads/1/3/0/6/130621857/9727266.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_off0000b964.bin
288526baeaca13e6a10c824ba8065f62555da2032066fdcd384fb4fc124c28f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB964 9392 bytes

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