Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0f5948a8c96875…

MALICIOUS

PDF

47.1 KB Created: 2020-04-09 10:31:52 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d7ae51d6a089200af4b71654cf8cee8d SHA-1: 23b66857d14eeb1cba6fb9c142798ac31202abb9 SHA-256: 1a0f5948a8c968757b160932a42dea0bb053a9834790d14e8c150f8b6e4309b0
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO spam or to distribute further malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample, but the extensive link farm suggests a delivery or redirection mechanism.

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://skinspiritlife.com/uploads/1/3/1/4/131453542/131453542.html#formula+for+finding+magnification+of+a+telescope
    • http://itsurcure.com/uploads/1/3/0/5/130589240/resisi.pdf
    • http://ace-health.com/uploads/1/3/0/6/130620537/fa02cf022248fa2.pdf
    • http://harrisonresourcecorporation.com/uploads/1/3/0/2/130291365/tepudisaje-finekasurod-devolasezelikin-jopelexex.pdf
    • http://bargeacbll.com/uploads/1/3/0/3/130379479/27c07d.pdf
    • http://surreypersonalbest.com/uploads/1/3/0/3/130313026/1232791.pdf
    • http://auniqueboutique4you.com/uploads/1/3/1/4/131406348/e51953d999.pdf
    • http://tooprettyforjail.net/uploads/1/3/0/7/130776346/nagimudexi.pdf
    • http://saraivatur.com/uploads/1/3/1/3/131384789/kirafapirete-botepoza.pdf
    • http://customdecorativemetalwork.com/uploads/1/3/0/5/130550985/2862565.pdf
    • http://eqdnala.com/uploads/1/3/0/4/130483478/loxegimum-vanasakeriba.pdf
    • http://mawmawtootsies.com/uploads/1/3/1/3/131384797/dakitamedem-lejaxoxovamudek.pdf
    • http://cyber-scribble.com/uploads/1/3/0/7/130776641/5726.pdf
    • http://pamstravelmagic.com/uploads/1/3/1/3/131380771/8867036.pdf
    • http://donovantile.com/uploads/1/3/0/8/130813453/pilukogezi_vazes_bomavoxoza_powavusur.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_off00008d55.bin
fbbc079a2d6d5071869a8ffcc44b430bfb55fc7b1ba31980859266e7927feccc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D55 8876 bytes

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