Malicious PDF — malware analysis report

Static analysis result for SHA-256 d594413fe3988bfe…

MALICIOUS

PDF

31.4 KB Created: 2020-05-18 20:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f19b9d9d35ee2eff1574135e11857e4f SHA-1: 0e4a7c4941adee0e66fef324a40b156bd6f71f6a SHA-256: d594413fe3988bfe6283382fb71aa454b3452a0d6aecec0a32e3f917b89fe69f
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, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains some of these URLs, suggesting the primary purpose is to redirect users to a network of linked PDF documents, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://cadweebley.org/uploads/1/3/0/7/130739449/130739449.html#derecho+civil.+introducci%25C3%25B3n+y+personas
    • http://2dom.us/uploads/1/3/1/3/131379253/260dcbca35857f0.pdf
    • http://tentinytoesmi.com/uploads/1/3/1/3/131379874/14502603ad953.pdf
    • http://violetfusionstudio.com/uploads/1/3/0/7/130776823/bf86cc1a5cf6a.pdf
    • http://shannonhoulihan.com/uploads/1/3/1/4/131408033/c9c840d2.pdf
    • http://washingtonfuneral.org/uploads/1/3/0/4/130435509/wividu_lomomofeveveg.pdf
    • http://hygenierocks.org/uploads/1/3/0/6/130604179/bitum.pdf
    • http://thats-amore.info/uploads/1/3/0/2/130289229/parosu.pdf
    • http://jennifersblingtastic.com/uploads/1/3/1/0/131070238/tujivugezonexojo.pdf
    • http://yogateacherfund.com/uploads/1/3/0/3/130313249/0ca081eb593fe11.pdf
    • http://mcfarlandtowing.com/uploads/1/3/1/3/131398066/a92ae8f.pdf
    • http://stretchedmama.com/uploads/1/3/0/8/130814187/354268.pdf
    • http://chedupr.org/uploads/1/3/1/1/131163712/minexedubebewilitov.pdf
    • http://affordablewarbird.com/uploads/1/3/0/4/130435682/4b8a8a29b4177.pdf
    • http://mummaherbssoftplay.com/uploads/1/3/1/3/131381332/gazorekotak.pdf
    • http://jamessanders.biz/uploads/1/3/0/2/130272347/jovexik.pdf
    • http://mygoatjob.com/uploads/1/3/0/4/130476039/9016633.pdf
    • http://caterers.solutions/uploads/1/3/0/2/130270906/kotak.pdf
    • http://drwpools.com/uploads/1/3/1/1/131163931/savifon_jixuduk_zibilazeb_lubodigudutajav.pdf
    • http://harvesteats.ca/uploads/1/3/1/4/131438405/pivemidupelawekekem.pdf
    • http://alplausunmc.com/uploads/1/3/0/2/130288962/8793841.pdf
    • http://blessoncompany.com/uploads/1/3/0/8/130873863/befotiwevonekup-dalevuno-livonasi-pefodapotala.pdf
    • http://sacredkriyations.com/uploads/1/3/0/3/130312986/ad1656bdcd3.pdf
    • http://crossbarpartners.com/uploads/1/3/1/4/131452934/bee8d5435.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_off000051b0.bin
aa293daefcbc6dd19f7dab329a4988f5bb01fe0be6bbcecb01adc7dc162d1eaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51B0 9220 bytes

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