Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e443d211b33b9a…

MALICIOUS

PDF

129.6 KB Created: 2020-04-09 22:24:54 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca275af2c2a98e7a165895c29fbee066 SHA-1: b256452535dbbc90c00369c823707acee75b7698 SHA-256: 38e443d211b33b9ad29c78271506c5c4949764303fbb7233e6c39eb4ebb0ad04
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, many of which point to seemingly unrelated PDF files hosted on various domains. This behavior is indicative of a link farm or a mechanism to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs supports this assessment. No scripts were extracted, but the overall structure suggests a delivery mechanism for potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://new-curry.com/uploads/1/3/0/7/130738503/130738503.html#ang+probinsyano+january+8+2018
    • http://dismantleddiaspora.com/uploads/1/3/1/4/131437599/tesukasuvemulekuzubi.pdf
    • http://idivertido.com/uploads/1/3/0/9/130969907/volomob.pdf
    • http://nurasmimarlik.com/uploads/1/3/0/7/130739072/jidugu.pdf
    • http://lovelysomethingsshop.com/uploads/1/3/0/3/130313057/bezenonetavurexoxadu.pdf
    • http://erotihub.com/uploads/1/3/1/4/131484328/dibozib_jevuxumi_ribujubozega.pdf
    • http://ruhsjsa.com/uploads/1/3/0/8/130814070/kifanojaveko-kepisug.pdf
    • http://biddestonestud.com/uploads/1/3/1/3/131381088/bawixaride-razenol-saveved.pdf
    • http://pastordom.org/uploads/1/3/0/7/130739053/3128224.pdf
    • http://sceonline.net/uploads/1/3/0/2/130270882/8b8b1.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c043.bin
3c722813109129ee14485c982007c974b5f8e05442fe65d07a1fc6d9a47ce431		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1C043 9400 bytes
font_01_sfnt_off0001e3af.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E3AF 16036 bytes

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