Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13fca41257d0ca8…

MALICIOUS

PDF

30.9 KB Created: 2020-06-15 15:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29154b4df52c2397562c8fcf560c8393 SHA-1: 08ac979117dd08970a369d1084602d4a0bf7ede3 SHA-256: c13fca41257d0ca8fc7b0a7c948446adfd62c803a8e4b27e80965cbe7585e3d8
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains numerous external links, many of which are hosted on domains that appear to be part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to a specific manual and URLs that suggest a lure to external content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. The primary attack pattern observed is the creation of a link farm to potentially host malicious content or engage in SEO manipulation.

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://shallop40.pleasingfood.com/uploads/1/3/1/6/131637104/131637104.html#acer+travelmate+7730+manual
    • http://ameliaquilts.com/uploads/1/3/0/4/130435672/gekorip_xejavixod.pdf
    • http://kelseyevansart.com/uploads/1/3/0/7/130776366/fuzorore.pdf
    • http://canyoncreekgundogs.com/uploads/1/3/0/6/130604430/gamosu_kufewizitudiwa_tomude_xosovigivi.pdf
    • http://pitchblackart.com/uploads/1/3/1/4/131437089/ronagefumopekag-tobenatikeva-marosawokalokub.pdf
    • http://jonathanjbell.com/uploads/1/3/1/8/131856347/pazonuwitolod_widezu.pdf
    • http://daytonbathrenovations.com/uploads/1/3/1/6/131636692/cb12a0cdbb9da.pdf
    • https://wanugonile.files.wordpress.com/2020/06/84617354329.pdf
    • https://rizifuto.files.wordpress.com/2020/06/33293892280.pdf
    • https://zabipapubu336182313.files.wordpress.com/2020/06/94919558014.pdf
    • https://vigazot.files.wordpress.com/2020/06/nopezapuje.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_off00004e0b.bin
5016b28a3ddefbff28f39f86ae94bc628f128f5f2d6e443e1a691277547d6c47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E0B 10200 bytes

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