Malicious PDF — malware analysis report

Static analysis result for SHA-256 b431ad458b3060f3…

MALICIOUS

PDF

41.4 KB Created: 2020-05-13 18:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b216d8a7514f8d2f030b9d83507a766 SHA-1: 05cc376c49a7bf2bf72d6dd401b6073e3c4b00c5 SHA-256: b431ad458b3060f3c45d625f404e6859edde9dc595a1f6ba1bd5085d406364b8
94 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing a large number of external URLs pointing to other PDF files or HTML pages. The ML classifier strongly flagged this sample as malicious. The primary attack pattern involves luring users to click on these numerous links, which likely lead to malicious content or phishing sites.

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://jarrodhodskinsr505.com/uploads/1/3/1/4/131410736/131410736.html#android+studio+logcat+filter+disappear
    • http://shantiwellnessstudio.com/uploads/1/3/0/4/130436014/gibuno-jigidomufomub.pdf
    • http://sensitivoantonio.it/uploads/1/3/0/9/130969435/pazixepa.pdf
    • http://oakgrove-baptist.com/uploads/1/3/1/4/131454345/5178134.pdf
    • http://regularbarpros.com/uploads/1/3/0/4/130483770/8340383.pdf
    • http://health-crave.com/uploads/1/3/1/4/131454986/9493231.pdf
    • http://wyerstrucking.com/uploads/1/3/0/5/130588701/zugevefoj.pdf
    • http://fastestwaytoloseweightsystem.com/uploads/1/3/1/1/131164475/daroragexaleleze.pdf
    • http://k9bnt.com/uploads/1/3/0/6/130621579/nokiwajozu.pdf
    • http://zhiraf.site/uploads/1/3/0/4/130477074/13629ad50.pdf
    • http://viafashions.com/uploads/1/3/0/8/130874594/9524987.pdf
    • http://mepsystems.org/uploads/1/3/0/7/130738918/doxaxujelasu.pdf
    • http://searchfortruthcounseling.com/uploads/1/3/0/7/130776031/9214696.pdf
    • http://thelowkeyclothes.ca/uploads/1/3/1/6/131606431/lodoxojujo.pdf
    • http://alziled.com/uploads/1/3/1/0/131070112/disasugif.pdf
    • http://crazzynuts.com/uploads/1/3/0/7/130740089/bfbed8c1b445dc.pdf
    • http://lorenkeithjordan.com/uploads/1/3/0/4/130483906/9424516.pdf
    • http://swrstructural.com/uploads/1/3/0/4/130483114/9015423.pdf
    • http://presidentialcigarden.com/uploads/1/3/0/6/130604205/3329141.pdf
    • http://teaismedicine.org/uploads/1/3/0/2/130289241/0c269ee43205beb.pdf
    • http://daniel-pascual.com/uploads/1/3/0/6/130620952/nozupe.pdf
    • http://tlcschoolanddaycare.com/uploads/1/3/1/3/131384070/001a955f4.pdf
    • http://genesisskinbeauty.com/uploads/1/3/0/7/130739344/bovega.pdf
    • http://tomarwatersystems.com/uploads/1/3/0/5/130538996/9dd40422ac3d9.pdf
    • http://bentanimalshelter.com/uploads/1/3/0/6/130603945/94bd30755b16cb5.pdf
    • http://neuropsychologiemontreal.com/uploads/1/3/0/7/130739751/5964754.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_off00007719.bin
cbe3d533490b83d8730cd0195195f67dca5a1daf000996aeb7f88bb6a17e215f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7719 9900 bytes

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