Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcffd74514e06104…

MALICIOUS

PDF

42.0 KB Created: 2020-04-11 13:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 173ff1c7357b47ca997becc0a3b30884 SHA-1: 5cdad1ac9dbf5282e135ea9c35ce33fb0be11a3c SHA-256: dcffd74514e06104867a845f0e50274ec0ff2685ad3373d69585c37c5cbfbcc3
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also flagged this PDF as malicious with high confidence. The embedded URLs and the structure suggest a link farm or SEO abuse tactic, potentially used to distribute further malicious content or manipulate search engine results.

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://seizediem.com/uploads/1/3/0/9/130969330/130969330.html#sairat+zala+ji+instrumental
    • http://c-springs.com/uploads/1/3/0/4/130488812/norasazomimewupuraso.pdf
    • http://1533quartet.com/uploads/1/3/0/6/130603728/94f16a3989288e.pdf
    • http://davinross.com/uploads/1/3/1/3/131383604/rogoduxepali_gedevimaliguji_pefekakogaviri_ramejixoreja.pdf
    • http://centuryglassdfw.com/uploads/1/3/0/6/130604594/6636108.pdf
    • http://facialplasticsurgery.news/uploads/1/3/0/8/130813518/towoxerakida_biligisedid.pdf
    • http://tissuetales.net/uploads/1/3/1/3/131380885/91cfd60.pdf
    • http://onpitchroofing.com/uploads/1/3/0/7/130739128/95c06c5ea12.pdf
    • http://helpinghandscoaching.com/uploads/1/3/1/3/131380641/91c1c3bc9e9e.pdf
    • http://mightypunk.com/uploads/1/3/0/8/130813378/6407146.pdf
    • http://rollingstorage.org/uploads/1/3/1/4/131483440/sugazebolesovalesuga.pdf
    • http://figisinc.com/uploads/1/3/1/3/131379253/9cda3a829.pdf
    • http://krescentconsulting.com/uploads/1/3/1/4/131455232/784f1d30870.pdf
    • http://422303300893226265.com/uploads/1/3/0/6/130639283/rerekudimazav_xovosunakuserip_sasukinogo.pdf
    • http://kengrillgators.com/uploads/1/3/0/8/130874007/fafatig-mojixijuw-sapepa.pdf
    • http://mbcue.com/uploads/1/3/1/4/131455722/d8b0f30a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005188.bin
aa1e2cba79a1db24b401bcf368cbd07dafd4ffce96548dacab5b518fd3614fc2
pdf-font-stream PDF embedded font (sfnt) at offset 0x5188 7908 bytes
font_01_sfnt_off00007039.bin
d96a281a5d1cf7af07656af440e0c672133091b5ff9b9945a71cbed7cab9f286
pdf-font-stream PDF embedded font (sfnt) at offset 0x7039 6020 bytes
font_02_sfnt_off00008595.bin
45c39c4315a5d00962143d4102937301eb2649728d6de39b959633cfc30365c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8595 16144 bytes