Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e31f8296f9f725…

MALICIOUS

PDF

71.2 KB Created: 2021-02-13 10:18:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: dedc1ef329b3612941dcfdf18231e334 SHA-1: a64925ea411845a589658c71a08880f506d3d0a6 SHA-256: 33e31f8296f9f7259351af2d92d89d9b5a973c33e0cd6651a7dd8f1666c418ba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM' containing 30 external PDF links. The primary external URI points to 'https://jottigo.ru/wix?keyword=the+jungle+quotes', suggesting a lure to a potentially malicious website. While no scripts were explicitly extracted, the nature of the PDF and the numerous external links indicate it's likely used for initial access via spearphishing, leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/wix?keyword=the+jungle+quotes PDF link annotation
    • https://dotijude.weebly.com/uploads/1/3/0/7/130740148/topakumamuw.pdfIn PDF document text
    • https://tajuwelaf.weebly.com/uploads/1/3/1/0/131071184/1242210.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/xazedotusomabosodu.pdfIn PDF document text
    • https://sizazadumaf.weebly.com/uploads/1/3/1/3/131398154/0b327aa22.pdfIn PDF document text
    • https://paweweribawu.weebly.com/uploads/1/3/4/6/134656346/37dc55c8d6b3c83.pdfIn PDF document text
    • https://dujejasafat.weebly.com/uploads/1/3/0/7/130739214/toxulaperebaka.pdfIn PDF document text
    • https://sijalafad.weebly.com/uploads/1/3/4/8/134887162/nexisexikerun_texilazer.pdfIn PDF document text
    • https://xawizavikerid.weebly.com/uploads/1/3/4/5/134525990/zijutesex_jivijutugulune_takibakenarogim_watadiwume.pdfIn PDF document text
    • https://joxeluduxena.weebly.com/uploads/1/3/4/7/134772203/5b72c27c3416.pdfIn PDF document text
    • https://wutodifutatur.weebly.com/uploads/1/3/2/8/132814097/1cb5f5ec2dd.pdfIn PDF document text
    • https://gugabezari.weebly.com/uploads/1/3/4/5/134577353/7d5f9936c.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/kudowo/osaka_train_map_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/play_iso_ps2_emulator_android.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/17014036201.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/88969189375.pdfIn PDF document text
    • https://s3.amazonaws.com/dalava/liwiwewepaxumi.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_off0000ddbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDBB 4792 bytes
SHA-256: af9906e005c76d2e2442cbf1d2090a103d644f92284bb38ca1a8c5596184172a
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 9896 bytes
SHA-256: 3972c19cca1fa526539dd2bf7e47a5e7623f5bc1c56a03ad271a721b5598914f

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