Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d382c0be4627e00…

MALICIOUS

PDF

40.4 KB Created: 2020-03-26 06:20:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0b31bcc226271dcdfd34fc5499a0402d SHA-1: 56118591afcc337317e25eadde5f96b9e9e2e191 SHA-256: 3d382c0be4627e00c87d9095792906b24e822e80ec22f08b20b64eeadcc501c0
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, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO spam campaign. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of this scheme. The primary goal appears to be redirecting users to potentially malicious content hosted on numerous domains.

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://fafaprofessionalhairbraiding.com/uploads/1/3/0/7/130775646/130775646.html#fisica+para+ingenieria+pdf
    • http://sunbizhrsolutions.com/uploads/1/3/0/5/130539940/3385527.pdf
    • http://thegayman.com/uploads/1/3/0/4/130477890/d08cb884a1e15.pdf
    • http://deericophotography.com/uploads/1/3/0/7/130776262/noxake_xanoxaburawoju.pdf
    • http://www.hereflections.org/uploads/1/3/0/7/130776493/44301f804.pdf
    • http://longdistancevoter.net/uploads/1/3/0/6/130620632/16bc7365bce731f.pdf
    • http://eyefinitymockpractice4.com/uploads/1/3/0/7/130738914/8f263399.pdf
    • http://privatesectorpeace.com/uploads/1/3/0/8/130813982/kalutolepenunif.pdf
    • http://zongandlaurentz.com/uploads/1/3/0/6/130604543/fadawa.pdf
    • http://www.addictionrevenuemanagement.com/uploads/1/3/0/7/130776734/kilaxe_wonovab_zekaluva.pdf
    • http://hostmaster.northwesthorseboxhire.com/uploads/1/3/0/7/130739462/ferunumosaba.pdf
    • http://www.aprilialogopedia.it/uploads/1/3/0/8/130813307/jafibosaj_wawivalozub_wixikifipaje_fibefolanafan.pdf
    • http://scottmemorialcog.com/uploads/1/3/0/8/130814845/1ea56a67010b450.pdf
    • http://ferreroferrero.com/uploads/1/3/0/5/130589241/javonilal-kuzitune.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_off0000719f.bin
cf1d18ca3ccf5cad1f82a9a39697cbec3e96cf048c8e38294e541a858c8ad6f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x719F 9280 bytes

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