Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8259072ede34ced…

MALICIOUS

PDF

77.1 KB Created: 2020-03-29 14:40:00 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 2732881e560245f1eb4f66468c075521 SHA-1: c4626be5bfdc58f79ac88fac60d38bf7d083fa7d SHA-256: e8259072ede34ced1a00473a150f8b761a46fcafc16f62236dc212077a4d49a0
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to domains that appear to be part of a link farm, suggesting a malicious intent to redirect users. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to URLs that are also present in the heuristics, reinforcing the link-farming attack pattern.

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://74-123-78-145.mgwnet.com/uploads/1/3/0/7/130775986/130775986.html#libro+metamorfosis+ovidio
    • http://staysjapan.com/uploads/1/3/0/6/130639327/votusudesamex.pdf
    • http://nocturnalparanormal.com/uploads/1/3/0/5/130542983/ridosoz.pdf
    • http://theleawoodfamilydentist.com/uploads/1/3/0/4/130435516/3f0a6e0.pdf
    • http://melissadance.com/uploads/1/3/0/4/130435791/7743792.pdf
    • http://ungendered.com/uploads/1/3/0/5/130544446/rekedetetagewu_tumaxijibawezel_soforixu.pdf
    • http://royalbeautysupplysalon.com/uploads/1/3/0/4/130488476/5988236.pdf
    • http://guardianconsulting.org/uploads/1/3/0/7/130776279/kimaxetej_varugutabisoru.pdf
    • http://shrinesearch.com/uploads/1/3/1/1/131163828/nabunufivejax.pdf
    • http://solermerwatches.com/uploads/1/3/0/7/130775622/ac4ae.pdf
    • http://mermaidexplorers.com/uploads/1/3/0/4/130489097/ximudunijiren-juwakijupogasal-nezirefevuri.pdf
    • http://realmisterketo.com/uploads/1/3/0/5/130541271/wamajejuju.pdf
    • http://businessboxing.club/uploads/1/3/0/5/130588936/fivawetaxixelubosif.pdf
    • http://eugenetyz.com/uploads/1/3/0/6/130604688/2036512.pdf
    • http://vossart.net/uploads/1/3/0/6/130621786/bosajadegupesuv-kagabude.pdf
    • http://mcypaa41.com/uploads/1/3/0/5/130540814/0fef4c42fb952.pdf
    • http://newenglandtaxserv.net/uploads/1/3/0/9/130969990/menenawokon.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_off0001047b.bin
17ec8e6657edba18f2a3f906c3f30528592d279fad57ed33e592ce2615cddf3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 9256 bytes

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