Malicious PDF — malware analysis report

Static analysis result for SHA-256 49216b8b4fd1137c…

MALICIOUS

PDF

38.5 KB Created: 2020-04-08 04:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e0ac07387d61765f9187285177e1ab8b SHA-1: e1117830fb1de1c76542d23d432da8a65299b692 SHA-256: 49216b8b4fd1137cab16ead9c671e85ce39dbd9cfa39558f9572eca0c635c55a
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 dynamically generated with numeric slugs, indicating a link farm or SEO poisoning attempt. The document body, though partially corrupted, contains a title related to calculus exercises, likely a lure to disguise the malicious intent. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is designed to redirect users to potentially harmful external sites.

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://fcunotaries.com/uploads/1/3/1/4/131407408/131407408.html#ejercicios+de+limites+indeterminados+por+racionalizacion+pdf
    • http://autodiscover.prairielandlutheran.org/uploads/1/3/1/1/131163983/niliteline_wimoti_bepizeletodo.pdf
    • http://sanluistattoo.com/uploads/1/3/0/7/130775951/281b73e33b5.pdf
    • http://intentio-editing.com/uploads/1/3/0/8/130874573/pefus.pdf
    • http://toledosymphonyleague.net/uploads/1/3/0/4/130476013/2067ff8.pdf
    • http://dusekplus.com/uploads/1/3/0/7/130738978/2452572.pdf
    • http://escueladetimpleabrahamramos.com/uploads/1/3/1/1/131164131/1382340.pdf
    • http://qodin.com/uploads/1/3/0/3/130312914/3abf4a80085a.pdf
    • http://poconohousepainting.com/uploads/1/3/0/6/130603724/sijonolomirur.pdf
    • http://mk3basketballclinics.com/uploads/1/3/0/6/130604161/jirixewo.pdf
    • http://www.frommylovetoyours.com/uploads/1/3/0/7/130738513/399384.pdf
    • http://bainhouse.org/uploads/1/3/1/4/131454065/d61213abae46196.pdf
    • http://maneater.online/uploads/1/3/0/7/130739766/nebanifekufalovarube.pdf
    • http://bialyinc.net/uploads/1/3/0/5/130551517/3368212.pdf
    • http://nasetsstadtradgardab.se/uploads/1/3/1/4/131407082/biduloriwo_wigukabubumine_mowapiv.pdf
    • http://patternpod.com/uploads/1/3/0/8/130874536/1381969.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_off00006be1.bin
f2412273ae4f79a4c02ee4d5a3e1742a10e24e1d19624fe46c87d26693d5fcbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BE1 8468 bytes

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