Malicious PDF — malware analysis report

Static analysis result for SHA-256 a26218b4dad9bb76…

MALICIOUS

PDF

33.8 KB Created: 2020-06-02 15:50:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: b2dd2e51dfb29e69c3d24fc8c5e61cce SHA-1: 94247e4c972b17e4e0d9e6f8a5aee126e54dccef SHA-256: a26218b4dad9bb76f8768666c85725e5ccaf95a4ccbcb2d9eaf365c061f4ed70
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains. The document body text, though partially obfuscated, includes a URL that appears to be a lure for watching movies. This suggests the PDF is designed as a link farm to distribute malicious content or phish users. The ML classifier strongly supports the malicious verdict.

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://gulfislandpickers.com/uploads/1/3/0/5/130550971/130550971.html#evrensel+f%25C4%25B1lm+%25C4%25B1zle PDF link annotation
    • http://desertsolitair.com/uploads/1/3/0/9/130969595/816f4115af8f.pdfIn PDF document text
    • http://swiftegypt.com/uploads/1/3/0/5/130589337/c83323.pdfIn PDF document text
    • http://humanitarian-neuropsy-project.org/uploads/1/3/0/6/130639540/bupijakululesud.pdfIn PDF document text
    • http://postmaster.creamwoodlabradors.co.uk/uploads/1/3/0/5/130546237/b03ee7.pdfIn PDF document text
    • http://liveawaregroup.org/uploads/1/3/1/4/131407494/9909369.pdfIn PDF document text
    • http://ucfamherst.com/uploads/1/3/0/5/130588813/dogusuk.pdfIn PDF document text
    • http://3dbd.net/uploads/1/3/1/1/131164136/a06cb9de87e98.pdfIn PDF document text
    • http://centralcoastrabbi.com/uploads/1/3/0/5/130588430/kosenapexibuzoj-gewag.pdfIn PDF document text
    • http://gulfislandpickers.com/uploads/1/3/0/5/130550971/terms.htmlIn PDF document text
    • http://gulfislandpickers.com/uploads/1/3/0/5/130550971/dmca.htmlIn PDF document text
    • http://gulfislandpickers.com/uploads/1/3/0/5/130550971/policy.htmlIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://tinugezova.files.wordpress.com/2020/05/23866536767.pdfIn PDF document text
    • https://kurasedi.files.wordpress.com/2020/05/rirofufetixirotufiku.pdfIn PDF document text
    • https://gubibegal.files.wordpress.com/2020/05/ganixowisuwamezula.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50D8 13584 bytes
SHA-256: d2f8eb653b54852f95f415c6a88e6ba1e10037ed44b1d6b76c65c81b9bfac40a

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