Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b23e3744ef7728b…

MALICIOUS

PDF

40.7 KB Created: 2020-03-28 06:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f54ab204bbaee7cf5cb1d968f1d32cb7 SHA-1: eac6293b130a94ce002b190d5c0442748890c60d SHA-256: 1b23e3744ef7728bd91a784f1fb5bd5616fa0c8700fafdb35408fd76b052e314
154 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Dropper.Agent-8047088-0 and ML classifiers indicate a high probability of maliciousness. The document functions as a link farm, containing numerous embedded URLs that point to external PDF files. This suggests a delivery mechanism for further malicious content or a tactic for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • ClamAV: Pdf.Dropper.Agent-8047088-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8047088-0
  • 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://hbcphx.org/uploads/1/3/1/3/131379230/131379230.html#ley+condominal+del+estado+de+mexico+vigente
    • http://webdisk.htlc-lagrange.org/uploads/1/3/0/2/130271121/lopok.pdf
    • http://firstaidhawaii.com/uploads/1/3/0/6/130621228/24487b9fe6d.pdf
    • http://www.ontariomotorcyclelaw.com/uploads/1/3/0/2/130274199/kuduzinigozof_sozekuwukomelo_zibunubejisasen.pdf
    • http://www.thebasicsoc.com/uploads/1/3/0/4/130483539/tugopojupe.pdf
    • http://k�rkortsmottagningen.se/uploads/1/3/0/9/130969448/f10d09fa.pdf
    • http://www.tandrsafety.com/uploads/1/3/0/4/130488968/rufifapifol.pdf
    • http://www.rlsclub.com/uploads/1/3/0/4/130488846/kipubovegepusef_potekokebi_febegosimaxi.pdf
    • http://74-123-76-65.mgwnet.com/uploads/1/3/0/4/130488888/zofeligebe.pdf
    • http://parentsshopusa.com/uploads/1/3/0/6/130605115/tiwitigopokel.pdf
    • http://hostmaster.alisonlawrence.com/uploads/1/3/0/5/130539583/litikop.pdf
    • http://www.mexicandriftchampionship.com/uploads/1/3/0/8/130814411/92504.pdf
    • http://wghsclassof82.com/uploads/1/3/0/2/130289519/15f9306a876.pdf
    • http://deceptionsucks.com/uploads/1/3/0/5/130539987/vadibesu_ruxuwiz_devezonevuvetaz.pdf
    • http://sinfulinfusionsbakery.com/uploads/1/3/0/6/130604198/vepoxufanuguk.pdf
    • http://movetheword.org/uploads/1/3/0/3/130379175/c7917b468.pdf
    • http://allbigskyrealestate.com/uploads/1/3/0/5/130551011/xomunuzuwu_nafuxizi_wobatab_sidivosa.pdf
    • http://www.prelovedwindandbrass.net/uploads/1/3/0/3/130313426/3831793.pdf
    • http://www.newsite.juliedoherty.com/uploads/1/3/0/3/130323210/2f76ee864687.pdf
    • http://classifieddivas.com/uploads/1/3/0/8/130874511/e5e64.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_off00007455.bin
9ab5690335abbcc6a7f634424b3b37a6cb4baf08babf485620f1e7abb6429a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7455 8772 bytes

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