Malicious PDF — malware analysis report

Static analysis result for SHA-256 be104b126f238ad1…

MALICIOUS

PDF

37.2 KB Created: 2020-03-23 11:47:24 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ef9e5c347c4039dc822504cf1b3fbe99 SHA-1: e33c43811a091b887446dae5ee4fe9b96044e739 SHA-256: be104b126f238ad1f6ff8984aa6cae3d20a09d1256942c04f7258be0323ca536
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, characteristic of a link farm. The primary heuristic 'PDF_SEO_LINK_FARM' indicates that this PDF is designed to generate traffic to numerous other domains, likely for SEO manipulation or to serve as a distribution point for further malicious content. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, and the document body is heavily obfuscated, but the presence of numerous external URLs is the primary indicator of 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://rehphotography.org/uploads/1/3/0/9/130969438/130969438.html#juntas+de+consejo+tecnico+sep+2019
    • http://newlifelasersk.ca/uploads/1/3/0/6/130603814/fipegatati.pdf
    • http://leaesthetics.org/uploads/1/3/0/3/130379604/jolur.pdf
    • http://agan.vip/uploads/1/3/0/5/130539691/2663761.pdf
    • http://www.sleepeasydentistry.org/uploads/1/3/0/7/130738706/7bb0deb870.pdf
    • http://www.conniepowersknits.com/uploads/1/3/0/8/130813466/luzalumi.pdf
    • http://graemedee.com/uploads/1/3/0/6/130620947/xawinimigor.pdf
    • http://capitolhillclubmembers.com/uploads/1/3/0/6/130639535/muzebapujin.pdf
    • http://chestnutpost.com/uploads/1/3/0/3/130379844/rutusetefitimo.pdf
    • http://scoopsintheloop.com/uploads/1/3/0/2/130289668/7340015b15b00.pdf
    • http://now-colander.com/uploads/1/3/0/6/130604826/lumek.pdf
    • http://2point7design.com/uploads/1/3/0/6/130639941/jolefugiravut.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_off00006557.bin
4e5afd6dfdba7fef308dbd13775409c1ca40f5afa29f9c63cf80e02f99449021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6557 9076 bytes

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