Malicious PDF — malware analysis report

Static analysis result for SHA-256 5939e55372a80dbe…

MALICIOUS

PDF

33.9 KB Created: 2020-06-06 04:18:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e35008d35b47cffe3eecaab807c8825c SHA-1: 6d869e34e444805df8192d56df0c3dcaa2c4b290 SHA-256: 5939e55372a80dbeee1360aaf7ede734d10213c61f7cc36076a736831ff19593
96 Risk Score

Malware Insights

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

The PDF document contains a heuristic firing for a link farm, indicating a large number of external URLs embedded within the file. The document body, though partially corrupted, contains a title suggesting a report, likely a lure to encourage users to click the embedded links. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of potentially malicious websites.

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://floralfaeriedesigns.com/uploads/1/3/0/3/130323724/130323724.html#reporte+de+evaluacion+primaria+2019
    • http://rentthetents.com/uploads/1/3/0/7/130739758/kaxevivopi.pdf
    • http://debatingsociety.org/uploads/1/3/0/2/130289748/mival.pdf
    • http://mrileync.com/uploads/1/3/0/7/130740558/temor.pdf
    • http://tshaylaslayher.com/uploads/1/3/1/4/131438483/jibasamibumapepewes.pdf
    • http://craftworkdetroit.com/uploads/1/3/1/6/131636774/b27e2829ab.pdf
    • http://floralfaeriedesigns.com/uploads/1/3/0/3/130323724/terms.html
    • http://floralfaeriedesigns.com/uploads/1/3/0/3/130323724/dmca.html
    • http://floralfaeriedesigns.com/uploads/1/3/0/3/130323724/policy.html
    • https://jewifafubod.files.wordpress.com/2020/06/29611857664.pdf
    • https://kadijaxeto.files.wordpress.com/2020/06/pegexuguw.pdf
    • https://dibozulanid.files.wordpress.com/2020/06/wefipibiwexelaremog.pdf
    • https://kozaxijewob.files.wordpress.com/2020/06/61885894149.pdf
    • https://lakuvipejuz106751964.files.wordpress.com/2020/06/safomiji.pdf
    • https://wekobatigis.files.wordpress.com/2020/06/42251587254.pdf
    • https://zasajeloso685135112.files.wordpress.com/2020/06/wodezaribipomarit.pdf
    • https://mumilawoku.files.wordpress.com/2020/06/woluwowiwazaralivikuse.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_off00005883.bin
42271476b959f7ad3fca89d96f2a25f00350a841ff4692e49fa4eec8479cd6be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5883 10540 bytes

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