Malicious PDF — malware analysis report

Static analysis result for SHA-256 6672ed5ff5815ec8…

MALICIOUS

PDF

42.9 KB Created: 2020-04-05 04:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8f9ba20ff0aca70a5b2f79b85dde82b3 SHA-1: bb6c53037071b02f7d1b2d2028428808127d8b8b SHA-256: 6672ed5ff5815ec8512fbf6f62319ef00f4e3463c3659faa6a5121e601d16e9f
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, many with numeric slugs, indicative of a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, includes URLs that likely lead to further malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://palyleis.net/uploads/1/3/0/6/130604597/130604597.html#norma+iso+17025+pdf+espa%C3%B1ol+gratis
    • http://ballintoberphotos.com/uploads/1/3/0/7/130775269/8daa1581cf274.pdf
    • http://bootycalltee.com/uploads/1/3/0/6/130605212/polorolowagerip.pdf
    • http://host49.carmichaelnl.com/uploads/1/3/0/6/130604517/zivotimelomonod_winonurovam.pdf
    • http://ngmsptsa.com/uploads/1/3/0/7/130739129/mubir-lavipezum-duwulekuj-kupad.pdf
    • http://northwestfineartstudio.com/uploads/1/3/0/6/130604040/wajikexop-wuretopo-nemim-tuvekag.pdf
    • http://familylifeinsuranceonline.com/uploads/1/3/0/2/130287799/fagugiret.pdf
    • http://blountstownumc.com/uploads/1/3/0/5/130589251/681133.pdf
    • http://jamaicanbookings.com/uploads/1/3/0/3/130323409/37d18f30.pdf
    • http://knitvegan.com/uploads/1/3/0/5/130551604/1319366.pdf
    • http://redneckpirates4.com/uploads/1/3/0/9/130969426/zekezerudu.pdf
    • http://arizonakayaking.com/uploads/1/3/0/5/130545818/ab13ae6129.pdf
    • http://largotermiteinspection.com/uploads/1/3/0/3/130323295/898374b8.pdf
    • http://maisconsultoria.net/uploads/1/3/0/2/130289262/5494851.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_off00006921.bin
4f26330bf9d9fa6d9bda936ff74a297a02d94337dc6786f452f918235f5c200d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6921 8288 bytes
font_01_sfnt_off000087a0.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87A0 16036 bytes

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