Malicious PDF — malware analysis report

Static analysis result for SHA-256 294c99c9f4ae9122…

MALICIOUS

PDF

37.1 KB Created: 2020-04-13 21:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 387f272bf551de00c02858642acaa074 SHA-1: 91dfd119e3e24f058b351c64a493239f7e95c91e SHA-256: 294c99c9f4ae912222f784f6aad19eed8cb27a07f5e6afa9b98931b501028791
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, many of which point to other PDF files, indicating a link farm or SEO manipulation tactic. The document body text, though heavily obfuscated, contains references to 'Carabinieri regolamento uniformi' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to disguise the malicious intent. 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://minnesotahydrographics.com/uploads/1/3/1/3/131383619/131383619.html#carabinieri+regolamento+uniformi
    • http://caseylang.com/uploads/1/3/0/9/130969934/wekagiwegisi_fugikilasaz.pdf
    • http://softwarepractice.info/uploads/1/3/1/3/131380733/sexizov_wazado_fukir.pdf
    • http://mandalicious.ca/uploads/1/3/1/6/131606168/kobefewum.pdf
    • http://globalneedworld.org/uploads/1/3/0/2/130287932/juroba_saxojonewex_xuzizefiba_zozapugerejeli.pdf
    • http://infirmiere-laciotat.com/uploads/1/3/0/5/130540699/xumawapagena_duxebufimumazaf_sawikofonozibib.pdf
    • http://parentalrightsmovement.org/uploads/1/3/1/3/131379801/7779560.pdf
    • http://makeupandexhale.com/uploads/1/3/0/2/130291884/2140847.pdf
    • http://thepricklypearaz.com/uploads/1/3/0/3/130323291/motuvuzaxuloja.pdf
    • http://fedortruba.ru/uploads/1/3/0/7/130739443/vosuba-logoli.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_off000068c0.bin
74242d333b60d8ab43dcd54a544a820db0846f5febccd5784cf52f94792a22cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C0 8416 bytes

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