Malicious PDF — malware analysis report

Static analysis result for SHA-256 c42a723b1bb91482…

MALICIOUS

PDF

70.7 KB Created: 2020-11-18 05:52:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 655720980ae5a50134702fb8ad755606 SHA-1: 26bfee13150ad8f50fe00a83858cd90087f76362 SHA-256: c42a723b1bb914827ab0dfb42f8fe2f1de9c4fefb4a1598c258096eb1800060b
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or SEO spam operation. The ML classifier strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://trafficel.ru/strik?utm_term=watch+teenage+mutant+ninja+turtles+c PDF link annotation
    • https://kuvofexe.weebly.com/uploads/1/3/1/1/131163751/tujoxakogafuxijoduw.pdfIn PDF document text
    • https://kezobonuduwu.weebly.com/uploads/1/3/4/4/134457579/salulof-dobunafeveriwil-jejoxiramoxi.pdfIn PDF document text
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/lixisikikaporamote.pdfIn PDF document text
    • https://zolefixu.weebly.com/uploads/1/3/4/4/134432518/tepowaruroxutunoxov.pdfIn PDF document text
    • https://kupanonul.weebly.com/uploads/1/3/4/6/134682697/nujolabunef_sovevamuzuri_xuwaxesasiw_magosezogife.pdfIn PDF document text
    • https://gupebaxederor.weebly.com/uploads/1/3/4/6/134691072/6493421.pdfIn PDF document text
    • https://pedegafulip.weebly.com/uploads/1/3/0/9/130969407/1cfb878a31bce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374535/normal_5faf9ad0e1329.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dojonuta/lake_lavon_water_level.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/49780298551.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/thrive_conference_2020_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d6ac7b-d589-4ee1-81d6-6ebee7708828/13803751433.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/wazugivetogofaradesozar.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 5300 bytes
SHA-256: 1bea98720f45b259072c6d7da17a8ad111b575dfb0396eabd00a27b600553357
font_01_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 9920 bytes
SHA-256: d8468c4e2b98c06795e1aaddc8934a1c2891c62b90cfd4fe42a569ea3c6f5a32