Malicious PDF — malware analysis report

Static analysis result for SHA-256 33637ae96e8c0568…

MALICIOUS

PDF

33.4 KB Created: 2020-06-15 01:17:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c44a1ba6b6288989592a01f019fd012e SHA-1: 30641aaeca5659f0da32e44341cf4d459d4d4d48 SHA-256: 33637ae96e8c05682951e607c10e64b3b240581267b525dae616206a8c5b4568
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://meteringireland.com/uploads/1/3/1/0/131070982/131070982.html#power+electronics+solved+problems+pdf
    • http://webmail.janethunter.com/uploads/1/3/0/6/130605306/8555399.pdf
    • http://slashfictionfilms.com/uploads/1/3/0/4/130489051/9916666.pdf
    • http://plexusslimlindsey.com/uploads/1/3/0/2/130287808/8652028.pdf
    • http://mail.lsbrpc.net/uploads/1/3/0/7/130776609/fabapiledovo.pdf
    • http://cpcalendars.enchantedcakesandtreats.com/uploads/1/3/0/2/130289474/541406.pdf
    • http://parkingdedominios.openventas.com/uploads/1/3/0/2/130270967/lubakel-fetowewaxajoli.pdf
    • http://endoflifecompanions.org/uploads/1/3/1/6/131607103/tubonowofoxa-niwusotoj.pdf
    • https://resotenedu.files.wordpress.com/2020/06/pesifuragegegir.pdf
    • https://guremev.files.wordpress.com/2020/06/seximuwebetijiwajodamipup.pdf
    • https://kijijoniwe413232708.files.wordpress.com/2020/06/rivukopikixetofune.pdf
    • https://zafukiw.files.wordpress.com/2020/06/kunajelagemudunes.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_off00005787.bin
57380c1ad9209b841a5f9d4e48fa492d12e5c2daf6634ce15774c6cc8e63209f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5787 10340 bytes

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