Malicious PDF — malware analysis report

Static analysis result for SHA-256 05dbdda7ae1375b5…

MALICIOUS

PDF

35.9 KB Created: 2020-06-20 19:41:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16216776a8a3689435384f16a0ecd131 SHA-1: 652dba1976c6eb28563dcb5ffab570a2bd4bc64a SHA-256: 05dbdda7ae1375b54f2895ad2aba427139264619a76d1b2e4465ba02f587dd05
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many of which point to suspicious domains with numeric or generic filenames, suggesting a link farm or SEO poisoning tactic. The document body, though partially corrupted, contains text related to an 'exercise programme for elderly' and includes several of these suspicious URLs. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://anzini4eid.com/uploads/1/3/0/6/130604257/130604257.html#exercise+programme+for+elderly
    • http://treeservicehuntingtown.com/uploads/1/3/0/2/130273625/48f12.pdf
    • http://farminthedell.net/uploads/1/3/1/8/131856161/jikupipo.pdf
    • http://tammysresidentialcleaning.com/uploads/1/3/1/4/131437984/piranabibiked.pdf
    • http://usflagproject.org/uploads/1/3/1/6/131606202/moveb_tagexaw_gasuwufefud.pdf
    • http://titanofficefurniture.com/uploads/1/3/0/7/130775712/tunoburumuzuwopolej.pdf
    • http://nofone.net/uploads/1/3/1/6/131606331/6759693.pdf
    • http://highteck.org/uploads/1/3/1/8/131856065/af653.pdf
    • http://loftaquebec.com/uploads/1/3/0/9/130969423/zogetusadenej-moratojaxamek-popavudoxuza-wifijesan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050e9.bin
23ea861bd379b7bf0b126a8b47de57268fb33b3208dd343f7b05aec12b68ebee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50E9 5204 bytes
font_01_sfnt_off000062a5.bin
a877c8f92bc8f3a70fa5c1dabfa1b9de55dacd45d5e429997b9bc39b954d44db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62A5 9656 bytes

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