Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5fe38af0cb798f…

MALICIOUS

PDF

36.1 KB Created: 2020-04-21 05:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 57828f5aee317ead2b8567d56e5a9a30 SHA-1: 469f625126be696a1684f5cc26ca87b231b392cd SHA-256: 5f5fe38af0cb798f01833b6df8541547a8ebecba8c64643ec1523a1822f99fcb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, indicative of a link farm or SEO spamming technique. The embedded URLs, such as http://joyouslyraw.com/uploads/1/3/1/0/131070071/131070071.html#aws+s3+bucket+cloudformation, suggest the document's purpose is to redirect users to potentially harmful content or facilitate the download of additional malicious files. The presence of numerous PDF links further supports the hypothesis of a malicious distribution or redirection scheme.

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://joyouslyraw.com/uploads/1/3/1/0/131070071/131070071.html#aws+s3+bucket+cloudformation
    • http://pkhomeinspections.net/uploads/1/3/0/2/130288775/nobisuvutov.pdf
    • http://freelivinco.net/uploads/1/3/1/4/131483110/78e04a091f5.pdf
    • http://cannotclose.com/uploads/1/3/1/6/131606168/vugedesif.pdf
    • http://sussexdance.net/uploads/1/3/1/4/131406252/4680270d509.pdf
    • http://doggynosesandyogaposes.com/uploads/1/3/1/6/131606629/3017993.pdf
    • http://selectscotchwhisky.com/uploads/1/3/1/4/131453945/bufovuxomuzap-zapab-vixekun.pdf
    • http://youandyournewborn.com/uploads/1/3/0/2/130272977/2260548.pdf
    • http://www.wavewalkersapparel.com/uploads/1/3/0/6/130639605/taziwavofodu-lefonowizef.pdf
    • http://pandl50.com/uploads/1/3/0/7/130739715/fixanogamajavu.pdf
    • http://verrem.studio/uploads/1/3/0/7/130775242/9282524.pdf
    • http://goldenboxminecraft.com/uploads/1/3/0/8/130813320/zebumovabovexipis.pdf
    • http://bajauncorked.com/uploads/1/3/1/3/131383497/berifowikesenikikoki.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_off000064d2.bin
ec9d1ae5e9ee1782e18cdb8418f2c896fcef4b40509835d133eef4ae13fa27b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64D2 8444 bytes

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