Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f06a52518c5b613…

MALICIOUS

PDF

67.2 KB Created: 2020-04-11 23:15:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b7eb2e8aa5819a89da36c8fe0b9b941d SHA-1: c485f353f51f76a7d3fe0b4c4dd47110a9896959 SHA-256: 6f06a52518c5b613670d3700578ab2454568ab0626193131dd0572b2d667859a
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to host malicious content. The ML classifier strongly indicated maliciousness, and the presence of numerous PDF links points towards a link farm attack pattern. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kalieanndickason.com/uploads/1/3/1/3/131384173/131384173.html#que+es+palabras+agudas+graves+y+esdrujulas
    • http://theurbanflautistas.com/uploads/1/3/0/5/130590778/3797424.pdf
    • http://guttenbergrentals.com/uploads/1/3/1/1/131164562/wefinisagagisim-worigid.pdf
    • http://palmerhairdesign.com/uploads/1/3/1/4/131453252/7210f8fa5.pdf
    • http://beautybybfm.com/uploads/1/3/0/4/130436074/disaxup-putesunixa-mubobogipezi-jodadipafupi.pdf
    • http://torihall.com/uploads/1/3/0/6/130605077/gamod.pdf
    • http://v2consultants.net/uploads/1/3/0/5/130539297/2435294.pdf
    • http://weekeepcompany.com/uploads/1/3/0/7/130739004/fa651dcaf50f.pdf
    • http://edermtest.com/uploads/1/3/0/9/130969141/e1e97dfc0cad96f.pdf
    • http://dare-women.com/uploads/1/3/1/4/131405962/1868850.pdf
    • http://westwaypictures.com/uploads/1/3/0/2/130288326/4322829.pdf
    • http://ricemachining.com/uploads/1/3/0/7/130739522/rimar.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense
    • http://www.adobe.com/).Noto
    • http://www.google.com/get/noto/http://www.adobe.com/type/This
    • http://scripts.sil.org/OFLNoto
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ab1e.bin
683c51b6df372eacf63b0eb3bce774431aa33d3e23cdc21c9aed71b58863edfa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAB1E 11548 bytes
font_01_sfnt_off0000d106.bin
bf9b9d10e9d9890ab9d1a7ec18efb3f3b6daf3583292778e90f0943f39e87841		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD106 2600 bytes
font_02_sfnt_off0000da03.bin
1a1701b296add1397c8badeabc8977320290c4910f8c6f71e6790b0c6b66e900		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA03 4128 bytes
font_03_sfnt_off0000e6ff.bin
e598ea20e030fd1dc82f5ce5108da6e14fbbe023c3766f39a635ab907c622a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FF 16508 bytes

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