Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed5bc4b4e10c496a…

MALICIOUS

PDF

32.6 KB Created: 2020-03-11 03:29:51 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: cf0837db93e6d6ae24f6f4a49eafebf6 SHA-1: 68a81c94502b1a1421f98f11f7ae6b64f6e6ad3f SHA-256: ed5bc4b4e10c496a65950259942200bd7f1b2e4645d0e96d68326c97797b3d4d
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is characteristic of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or inflate search rankings. The ML classifier strongly indicated maliciousness, supporting this assessment.

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://visionlinkshotelapartments3.devsite-1.com/uploads/1/3/0/7/130775835/130775835.html#arifureta+light+novel+volume+1+epub
    • http://www.angelavogl.com/uploads/1/3/0/2/130289211/3301091.pdf
    • http://makegreatfilms.com/uploads/1/3/0/6/130639887/vozijudupesa.pdf
    • http://www.cloudylildoll.com/uploads/1/3/0/7/130775694/zababitar.pdf
    • http://www.cameronweddings.com/uploads/1/3/0/7/130775088/8246853.pdf
    • http://realizingmedia.net/uploads/1/3/0/5/130539691/labisilidaje.pdf
    • http://www.vdesignv.com/uploads/1/3/0/7/130740130/kiwarod.pdf
    • http://bunnybeauty.org/uploads/1/3/0/7/130740255/6471237.pdf
    • http://swoapy.com/uploads/1/3/0/6/130621481/da2098832.pdf
    • http://www.buildaschoolinindia.com/uploads/1/3/0/6/130622011/pejabijigonar_ludozedog.pdf
    • http://www.toolgirl1.com/uploads/1/3/0/6/130639682/9622f1.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_off000057e7.bin
e1a96a844271f7998c15e77c7feefa516b3fc023476e6614b1051d70153459d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E7 7096 bytes

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