Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f580b58bd7015ac…

MALICIOUS

PDF

65.1 KB Created: 2020-04-06 06:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c6f5ed0b5f04e778d7956da52b72918b SHA-1: 8acc9e66a6243348b581a4c962d59422e57791c9 SHA-256: 7f580b58bd7015ac548f1c9306992577c9c02b5b95a36f16a5ea747622077db9
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a large number of external links, indicating a potential SEO spam or phishing campaign. The embedded content, though heavily obfuscated, contains URLs that are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://riversidecountyhistory.org/uploads/1/3/1/3/131398392/131398392.html#galaxy+s5+at
    • http://southernrugs.com/uploads/1/3/0/4/130483741/xenipidevuxime_ridadopukeniki_tifar.pdf
    • http://vickisuecreations.com/uploads/1/3/0/5/130550712/6031543.pdf
    • http://elevenupstudio.com/uploads/1/3/1/4/131437369/6761281.pdf
    • http://cofitpro.com/uploads/1/3/1/3/131379033/1536547.pdf
    • http://senyonga.com/uploads/1/3/1/3/131379181/zifixuto.pdf
    • http://amazon-dark.com/uploads/1/3/1/4/131438860/2029931.pdf
    • http://clubcast.ch/uploads/1/3/0/8/130874676/f054e0.pdf
    • http://theisalife.com/uploads/1/3/0/6/130604744/cb6d3.pdf
    • http://boudreauxsbbq.com/uploads/1/3/0/2/130274368/padalerajamam-runaruniledo.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf6c.bin
82cad316eda964a54f82561c28ce778026bce3698725d87dbb84b8e86c18870a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF6C 8944 bytes
font_01_sfnt_off0000e178.bin
b3affdfdfee497c2d3230853582529cf395d265bfdbb8cde7d84ae9c33602211		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE178 16036 bytes

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