Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3d8ba07d97cb5b…

MALICIOUS

PDF

30.5 KB Created: 2020-03-25 14:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 30002ebbf315f45803aff186ca58d005 SHA-1: 0daf045cf82ed487afa0993a156239effd1927b3 SHA-256: 7e3d8ba07d97cb5bb56b330bb6251739b9e8a0b34bb440ea020663cf1397587c
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The document body, though partially corrupted, contains text related to calculus formulas and mentions the authoring application, suggesting a lure. The primary function appears to be acting as a link farm, likely to manipulate search engine results or distribute further malicious content via the linked PDFs.

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://dilf.blog/uploads/1/3/0/7/130775391/130775391.html#formulario+de+integrales+y+derivadas+completo+pdf
    • http://ip174-124676.molyneaux.com/uploads/1/3/0/6/130621135/3ceda0920286ea.pdf
    • http://www.noworries-caretakers.com/uploads/1/3/0/6/130620792/367c157c.pdf
    • http://toursofcalifornia.com/uploads/1/3/0/3/130313272/5152f78fc198.pdf
    • http://comfortablechristianity.com/uploads/1/3/0/7/130776656/vovasedejawul.pdf
    • http://brunchmemphis.com/uploads/1/3/0/5/130539842/b8912.pdf
    • http://nicacov.org/uploads/1/3/0/2/130272372/9235249.pdf
    • http://motionautodetailing.net/uploads/1/3/0/4/130483492/funaj.pdf
    • http://dramallamaranch.com/uploads/1/3/0/8/130874666/50c82bac807.pdf
    • http://waterbeorn.com/uploads/1/3/0/9/130969489/kewas_pajewexamosuk_fokaxawat.pdf
    • http://vanillafancy.com/uploads/1/3/0/2/130289235/8587791.pdf
    • http://frankranch.com/uploads/1/3/0/9/130969568/bosoferefumul_kojunujogeju_podejur_getadezexoj.pdf
    • http://cheaptravelguaranteed.net/uploads/1/3/0/3/130313468/xiluz_kijibujuv_lugofapefe_dalez.pdf
    • http://www.vvs-playhouse.com/uploads/1/3/0/4/130435872/b168ecd7c562a6.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_off000053af.bin
e5fe2848c7a2d7de6066aac07cd635dc3dbb10081427f521ca1460a656e91a9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53AF 6612 bytes

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