Malicious PDF — malware analysis report

Static analysis result for SHA-256 8952a69634f41402…

MALICIOUS

PDF

38.1 KB Created: 2020-06-15 19:41:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c828b848870edb138cb3db171e7d89ff SHA-1: 3c6bf335025de69116ac45873ccacf4b54444d9c SHA-256: 8952a69634f414024ef865a3f26ec9dfa09c34802bf8fc89d673e27a52c85551
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm for SEO manipulation or malware distribution. The document body, though partially corrupted, contains text related to converting PDF to Word, which serves as a lure to encourage users to click on the embedded malicious links. The ML classifier strongly flagged this PDF as malicious.

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://bodybyjules.com/uploads/1/3/1/6/131606511/131606511.html#how+to+convert+pdf+to+word+in+macbook+air
    • http://kemungkinan.org/uploads/1/3/0/5/130546804/1559542.pdf
    • http://juicespancakelounge.com/uploads/1/3/1/0/131070493/92acc2dd5b33.pdf
    • http://sondrafinancialservicesllc.com/uploads/1/3/1/4/131438667/novaxo.pdf
    • http://rueyacorporation.com/uploads/1/3/0/8/130813997/d56fa.pdf
    • http://stephenho.org/uploads/1/3/0/7/130738739/vekerabelejuzi.pdf
    • http://baysidecrypto.com/uploads/1/3/0/2/130292173/6af70d41.pdf
    • http://mail.planp.be/uploads/1/3/0/8/130814935/jutamike_diruvibik_widonizerizut_tulizirasip.pdf
    • http://equityonecontractors.com/uploads/1/3/0/6/130621780/wodidipuvedo-jokivukunun.pdf
    • http://mlhconsultancy.com/uploads/1/3/0/5/130542717/925879.pdf
    • http://webdisk.kleinovies.co.za/uploads/1/3/1/4/131453355/09b6c06.pdf
    • http://vpn.stmartindp.com/uploads/1/3/0/6/130620972/fowosopa-ledepotutawa-nawuwimo-lofuziro.pdf
    • http://bullsnips.com/uploads/1/3/0/2/130289291/502781.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_off000068ee.bin
7f8f0ce01729915cae6a660cd349d2729f7945f12f734e7e53770a93d58dc3b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68EE 10616 bytes

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