Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec433b21f05c8051…

MALICIOUS

PDF

38.9 KB Created: 2020-06-11 22:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f74ccb52dd86ead962cf63d1d211bff9 SHA-1: f10b5d860645ede07f24312eff19ce84ea628e2e SHA-256: ec433b21f05c80512282c92f8b85b83a439d525ef38d88b22864377295413ef2
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded URLs. No scripts were extracted, and the document body is largely unreadable, making it difficult to determine the exact user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://perillianconsulting.com/uploads/1/3/1/4/131437626/131437626.html#microsoft+office+for+dummies+2010+pdf
    • http://hostmaster.tastecentralmarket.com/uploads/1/3/0/3/130323328/weganal.pdf
    • http://vestevichkids.com/uploads/1/3/0/4/130489530/rerojezugewekexaxof.pdf
    • http://holistictherapytullamore.com/uploads/1/3/0/4/130436058/sakazokuvowid-kivivamatufero-gunomi-pedarezodufe.pdf
    • http://eatsmarthealthyvending.com/uploads/1/3/0/8/130813132/7405166.pdf
    • http://spotlightsarasota.com/uploads/1/3/0/7/130775983/b518d880b8d.pdf
    • http://cpanel.jessdoinglife.com/uploads/1/3/1/1/131163890/3554202.pdf
    • http://sylvainladouceur.com/uploads/1/3/0/9/130969744/2273140.pdf
    • https://purupale.files.wordpress.com/2020/06/52349398117.pdf
    • https://xexuxapal968988247.files.wordpress.com/2020/06/dukeretimogopoxozu.pdf
    • https://podinerexine.files.wordpress.com/2020/06/xeriduvuzawu.pdf
    • https://zisiwemebix.files.wordpress.com/2020/06/1151668452.pdf
    • https://kulowufobe.files.wordpress.com/2020/06/36690359067.pdf
    • https://zutiguj.files.wordpress.com/2020/06/66286982449.pdf
    • https://bibefiv.files.wordpress.com/2020/06/vipesusivi.pdf
    • https://fekikawomupu.files.wordpress.com/2020/06/mikajapuvebenebodib.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_off00006c42.bin
99f58df983f4d60e7d2103300d10816c115cb71a6d4beba6eed07988b575fdbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C42 10520 bytes

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