Malicious PDF — malware analysis report

Static analysis result for SHA-256 c16b3f89beca53fc…

MALICIOUS

PDF

36.4 KB Created: 2020-06-25 16:22:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18966d4e373629a16769604ca6715bcc SHA-1: ea2d7e7a1325bea1caa44854ac0841559c2df748 SHA-256: c16b3f89beca53fc2cafb8383d7fc20c3014599235b80d8a96fd54c68d991d1c
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, a technique often used for SEO spam or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The document body contains a reference to an 'outlook tutorial' and numerous URLs, suggesting a lure to a phishing or scam page.

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://a1975851xstreamtravel.xsideas.com/uploads/1/3/2/7/132740837/132740837.html#2007+outlook+tutorial
    • http://ppy.life/uploads/1/3/0/5/130538925/desepusam-vakenip.pdf
    • http://digitaldadtribe.com/uploads/1/3/1/3/131384575/bupazuxamosivewoxi.pdf
    • http://themoneymadereal.com/uploads/1/3/0/6/130639983/6262738.pdf
    • http://bennymax65.com/uploads/1/3/2/3/132302894/1efb7e6dbd039b.pdf
    • http://fiberandpaper.de/uploads/1/3/0/5/130551091/womuja_jabuvikamogemu.pdf
    • http://mengtaosun.com/uploads/1/3/0/5/130540280/guvofoxes.pdf
    • http://mail.seakapparel.com/uploads/1/3/0/3/130323547/vizuzesejoderufukef.pdf
    • http://hostmaster.whitstablefringe.co.uk/uploads/1/3/1/4/131409574/09f1c4.pdf
    • https://lasogotunule.files.wordpress.com/2020/06/lijefugikozotubuto.pdf
    • https://rotuwepene1407802.files.wordpress.com/2020/06/zomufagaxuwudud.pdf
    • https://jitalexevumo.files.wordpress.com/2020/06/67079265809.pdf
    • https://bawodav.files.wordpress.com/2020/06/93517882728.pdf
    • https://lunigizuwuz.files.wordpress.com/2020/06/rokugifixesujegewumifefo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005521.bin
02132c199720b8a18d36d9c6fc17d8fc620a4333862428e17667f81b7384387f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5521 4480 bytes
font_01_sfnt_off00006458.bin
950b0f9d88e527f77138c237ad9a384fbf2cad1a9ad04f124c83d7f6f4d397e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6458 9568 bytes

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