Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cafafdca6e3734d…

MALICIOUS

PDF

73.2 KB Created: 2021-03-16 04:41:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 08fa7a2ffcf2ebf09b05b4cd51cd73ee SHA-1: 14fd9695c5731aa27a601f3bc4609312c7ebab11 SHA-256: 2cafafdca6e3734db7a2a43aa9b7ba5192c3e706c27e2a3595d1420db97b9c7d
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/strik?utm_term=verbs+worksheet+for+grade+3+with+answers PDF link annotation
    • https://cdn.sqhk.co/xubupigegi/jcAbH42/chat_usage_on_verizon_bill.pdfIn PDF document text
    • http://spoonnumberone.xyz/280685228829smi9.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/l5jgChh/wotilobukusod.pdfIn PDF document text
    • https://negapisege.weebly.com/uploads/1/3/4/6/134635707/ec15020e268278d.pdfIn PDF document text
    • https://xurowileziruroz.weebly.com/uploads/1/3/4/6/134624378/gemodepi_telisanewezod.pdfIn PDF document text
    • http://movilatur.iblogger.org/mumoverop.pdfIn PDF document text
    • http://raifaisentgo.online/bolowemenojipemanasubofrsu2e.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/satudifin/bebapejute.pdfIn PDF document text
    • https://31c8a3d4-0132-49f1-a04f-09c79d03e01f.filesusr.com/ugd/a4da84_e89f56fcc0c047eebfb6cd5d935b066a.pdf?index=trueIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_7d51eca24474440eadb4a5d7bbd9e8dc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rovuweraja/nikinap.pdfIn PDF document text
    • http://derizarage.epizy.com/35989374241.pdfIn PDF document text
    • https://ef9935f7-a918-44a1-999f-f1d50a45e4a7.filesusr.com/ugd/b463f2_308eb84271c944a19ec6c82f70d2bf1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/backgrounds_for_photoshop_free.pdfIn PDF document text
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_60c15a43e18d4a63a7a2dec3f48af468.pdf?index=trueIn PDF document text
    • https://4adff18d-dc39-4349-be2c-eeb12737f1cb.filesusr.com/ugd/9117e0_7322954693e04ae8b79b6a3d113cdf52.pdf?index=trueIn PDF document text
    • http://tumawom.epizy.com/shure_ulxd4_manual_espaol.pdfIn PDF document text
    • http://nasakil.rf.gd/add_text_to_adobe_acrobat_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/7859107141.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_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 5560 bytes
SHA-256: 548ed0db44d2ac6997633a0fb8a3864c2fb3e8b22a0a63548746700bee090bd5
font_01_sfnt_off0000f2d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D9 10780 bytes
SHA-256: 2242d93af3d067c7a23a095f870afc80882a8ca57271ce6c8e6ebc6375178d94

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