Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9a356b6eff79491…

MALICIOUS

PDF

38.8 KB Created: 2020-04-27 07:01:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-09-25
MD5: 72dd0d1a2d0a5ad4f6d7480917da7145 SHA-1: f4f5a926f57d90ced3272bd9a82a6cd139f83cc7 SHA-256: f9a356b6eff79491aa977618fa0da5a4c4e63a714f6ee848bcdf4999eca630b3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://lennoxweb.com/uploads/1/3/1/4/131483955/131483955.html#adjective+degree+exercises+with+answers PDF link annotation
    • http://meghanleeallen.com/uploads/1/3/0/6/130620275/15087.pdfIn PDF document text
    • http://air8kiteboarding.com/uploads/1/3/0/8/130874129/jawasetepudafox_laxojuz_wopivegidow_butasarenew.pdfIn PDF document text
    • http://cbaquintet.com/uploads/1/3/1/8/131856715/fujuzipimifilos-ralefepagexex.pdfIn PDF document text
    • http://graceandgigglesboutique.com/uploads/1/3/1/3/131398279/tawijobibebe.pdfIn PDF document text
    • http://quahogsolar.com/uploads/1/3/0/5/130539979/setajuxejoxusudup.pdfIn PDF document text
    • http://wailukuunionchurch.com/uploads/1/3/0/7/130775835/3563802.pdfIn PDF document text
    • http://homefeltsomerset.com/uploads/1/3/0/3/130323573/89e2ae3aca51.pdfIn PDF document text
    • http://beckermnunited.org/uploads/1/3/1/6/131606778/lajuxemetiradez.pdfIn PDF document text
    • http://rosebudcaresforyou.com/uploads/1/3/0/5/130540214/duguloj_merosozidanone_tigamomodasonu.pdfIn PDF document text
    • http://baltimoredotphysical.org/uploads/1/3/0/7/130739836/dexoligesu.pdfIn PDF document text
    • http://mod-conference.com/uploads/1/3/0/6/130620957/wapuxaradinelunu.pdfIn PDF document text
    • http://akconsulting.info/uploads/1/3/0/6/130621131/f7f36281.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_off00006ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED7 7792 bytes
SHA-256: 36c888939b2ed026358b758b671c340f6ea0195412537f79530fd3d0935b6752

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