Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f457709af5bcee6…

MALICIOUS

PDF

39.9 KB Created: 2020-03-29 05:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b30e5a246d43a6f31c29fb05366eed8 SHA-1: f17a0323c24a8a2b91a7cfdad44d62bbcb3f4c3f SHA-256: 5f457709af5bcee6cef96f55b61649caaeff18eb7bc0e9c006219539b288bd98
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, suggesting a link farm or redirection mechanism. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external URIs indicates an attempt to lead the user to potentially harmful content. No scripts were extracted, but the structure and heuristics point towards a malicious PDF designed to distribute further content.

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://foothillsbiblefellowship.com/uploads/1/3/0/7/130740498/130740498.html#costco+spanakopita+baking+instructions
    • http://prrealty.net/uploads/1/3/0/7/130776827/dovowuju_lakegabitudomef.pdf
    • http://topangastore.com/uploads/1/3/0/7/130775466/7618dcc595.pdf
    • http://nazcamp.org/uploads/1/3/0/6/130604197/mukutubodawimel.pdf
    • http://noosalittlecove.com/uploads/1/3/1/1/131163857/8408645.pdf
    • http://remote.bbmaint.com/uploads/1/3/0/2/130287915/lutuxamiv-satepawixef-vesilepojajos.pdf
    • http://successoffthefield.com/uploads/1/3/0/5/130551115/1008f6cf00b2.pdf
    • http://tinabco.com/uploads/1/3/0/3/130313203/eb0b0f64c2901e3.pdf
    • http://greatlakesbaymentalhealth.org/uploads/1/3/0/6/130604317/120d4edab523f.pdf
    • http://equinelogic.org/uploads/1/3/0/5/130545434/5842811.pdf
    • http://learnenglish5050.com/uploads/1/3/0/7/130739704/womawenikepusi.pdf
    • http://lasiembramx.com/uploads/1/3/0/8/130814237/9db309e.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/
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006626.bin
1503b06fb7789ad97efe2eb9403b8d54cc646ae4cc06a8571d718efe1d2d06a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6626 8092 bytes
font_01_sfnt_off00008551.bin
885781ec91db75dc8c4a6a3d3dac0324bdfdb8f2239dab70466c62035ae072da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8551 4144 bytes

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