Malicious PDF — malware analysis report

Static analysis result for SHA-256 228064e49e295099…

MALICIOUS

PDF

33.2 KB Created: 2020-04-28 22:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e8500202b1533a22bb59114e6c2844b9 SHA-1: 03cffd5e40dfc8ba166a64a45caffffef24936b9 SHA-256: 228064e49e295099c96e92521ec62f1681fa3a69d39f2d8d18784cadc74675c4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam operation. The document body, though partially corrupted, contains text referencing an "emotional video in tamil" and includes URLs that align with this lure. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious link farm.

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://islamophoria.com/uploads/1/3/0/5/130551720/130551720.html#emotional+video+in+tamil
    • http://colormezen.com/uploads/1/3/0/6/130621554/1864329.pdf
    • http://rooforest.com/uploads/1/3/0/4/130483537/daa01de2fa68.pdf
    • http://thecharlestontradecenter.com/uploads/1/3/1/6/131637248/loveku-wukovizaw.pdf
    • http://winzdaychild.com/uploads/1/3/1/3/131379874/vanexivuvaroxut.pdf
    • http://charlieschaffermusic.com/uploads/1/3/0/6/130639856/8280801.pdf
    • http://tessacristan.com/uploads/1/3/1/4/131410485/nofivusobiri-fasuxuvozusenu-kanejo-kazifipanadale.pdf
    • http://theseoldshades.com/uploads/1/3/1/0/131071019/412a50.pdf
    • http://clovercreeksoap.com/uploads/1/3/1/4/131408581/f7ced.pdf
    • http://ltle370.com/uploads/1/3/0/5/130547116/643c0a.pdf
    • http://ellierusinova.com/uploads/1/3/0/6/130604756/aed820.pdf
    • http://fighting-dementia.org/uploads/1/3/0/7/130738740/6344623.pdf
    • http://electrocabin.net/uploads/1/3/0/7/130738784/vimaje-zesoxo-dufatekil-wajizoxajab.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_off00005b7e.bin
395c7537f5f7e38c7c0592600143cab2e1b468845e6df7f6a4cde5e6746dbed2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B7E 7616 bytes

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