Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f45f24c83786c56…

MALICIOUS

PDF

35.2 KB Created: 2020-04-11 07:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d74b29a756fc2b22445e9c41ccc955bd SHA-1: 8f11f024cdacd74849306095548268194f1c7d22 SHA-256: 2f45f24c83786c5684ff172f67890b0c4ef6de94ef92186403a980080a01db15
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document's primary purpose is to act as a link farm, potentially for SEO manipulation or to 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://trentriverdesigns.com/uploads/1/3/0/4/130476499/130476499.html#drunvalo+melchizedek+serpent+of+ligh
    • http://gdsmithmusic.com/uploads/1/3/0/7/130776176/lekupudomigomixe.pdf
    • http://successorama.com/uploads/1/3/0/3/130324419/totijud_ratepad.pdf
    • http://lovethecity.net/uploads/1/3/1/6/131637257/9cac9537.pdf
    • http://abcdobebe.pt/uploads/1/3/0/5/130551429/2768865.pdf
    • http://vuongglobal.com/uploads/1/3/0/7/130776542/fedoxironeteb_gadowuxoxuzumi_sivemimugopid_zabufezexilover.pdf
    • http://finegerman.com/uploads/1/3/0/4/130435551/libisibuvigu-robegeno-zenevurorajelop-kilusobib.pdf
    • http://walkerhydraulicsales.com/uploads/1/3/1/3/131380297/36da38e3f86a70.pdf
    • http://americanbusinesshero.org/uploads/1/3/1/3/131398509/sixazawajukeg.pdf
    • http://whatnotvermont.com/uploads/1/3/0/5/130539517/1186775.pdf
    • http://serception.com/uploads/1/3/1/4/131438829/1508010.pdf
    • http://girlzwithguns2019.com/uploads/1/3/0/5/130588988/fakabaji_faparer_mijelivifem.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_off00006271.bin
7d977bee3642fcd0712c5cf26d411673ae21a94010e5deb69eb3b40f69644a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6271 7816 bytes

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