Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b533610b93057ca…

MALICIOUS

PDF

37.1 KB Created: 2020-03-28 12:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eaf105096a617de6746f96bd6b0b46f3 SHA-1: f12bc9e3cda03dc8f601af9914a0137b7f7dd39e SHA-256: 0b533610b93057ca35d1fcea14ce45bd95765a0f412a7e884150952640eb2971
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains text related to geometry exercises and metadata from wkhtmltopdf, suggesting it was generated programmatically to host these links. The primary attack pattern involves directing users to a vast array of external URLs, likely for SEO spam or to serve further malicious content.

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://uptonvfw.com/uploads/1/3/0/5/130539612/130539612.html#ejercicios+de+area+y+perimetro+de+un+rectangulo+resueltos
    • http://clevelandrei.com/uploads/1/3/0/6/130603892/tutit_virotuwam_webupujiveluk_rulugupivik.pdf
    • http://visionwall.vision-networking.ca/uploads/1/3/0/6/130604706/wubonutebozemofulol.pdf
    • http://sondrafinancialservicesllc.com/uploads/1/3/0/5/130540874/257a1f74.pdf
    • http://utahinvestorsgroup.com/uploads/1/3/1/3/131383621/6438988.pdf
    • http://handipapers.com/uploads/1/3/0/6/130621123/nametedizibuw_wiwotezuwibepof_diwupewe.pdf
    • http://newgreenlawnscaping.com/uploads/1/3/0/6/130639997/5750666.pdf
    • http://ajnasynergy.com/uploads/1/3/0/6/130620609/826016.pdf
    • http://www.oneyouthyoga.com/uploads/1/3/0/4/130483364/birelizameseton.pdf
    • http://mplusjclothing.org/uploads/1/3/0/2/130291910/nemijevefu-wagapelebu-fimavu-kokuzo.pdf
    • http://henryfrondorf.com/uploads/1/3/0/8/130813063/8705649.pdf
    • http://sonjawilliamsdesigns.com/uploads/1/3/0/8/130814861/2124900.pdf
    • http://thestarwarssignal.com/uploads/1/3/0/7/130776454/pajomuzokuj.pdf
    • http://lilaclcana.com/uploads/1/3/0/3/130379422/jekopifewabew_sidovopubefavi_lupal.pdf
    • http://gmedltd.com/uploads/1/3/0/7/130740242/6934732.pdf
    • http://www.obancodetodos.com/uploads/1/3/0/8/130874124/8862772.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_off00006693.bin
8d6c4fa67218008c39b6c7c4239a17f092de40fd761eef3684cb83ee933c8f99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6693 8436 bytes

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