Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ee8c53feb27707…

MALICIOUS

PDF

75.3 KB Created: 2021-02-20 14:39:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cb19a0f05bd2b11e906e0d7a924558ec SHA-1: 356a0374b1af3940a7dfc8b76f89e1c063e5fe72 SHA-256: 28ee8c53feb27707347c08a259eac030b581fad697722be9511095b84424a7e5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with one heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM', suggesting an attempt to distribute malicious content or engage in SEO spam. The document body, though heavily obfuscated, contains text related to a book search, likely a lure to encourage users to click on the embedded malicious URLs.

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://leonvi.ru/wix?keyword=ensayo+sobre+la+ceguera+pdf+libro+completo PDF link annotation
    • http://lienforkid.com/centinela_valley_ipa_authorization_request_form2xz6h.pdfIn PDF document text
    • http://kutufirix.iblogger.org/61635463656.pdfIn PDF document text
    • http://pubgmobiie.com/debuwarosefid0aro4.pdfIn PDF document text
    • http://yandex-delivery.cc/android_app_store_data_on_cloudaeb68.pdfIn PDF document text
    • https://vamekatowozi.weebly.com/uploads/1/3/0/8/130814347/37170887b6b2.pdfIn PDF document text
    • http://callipakk2.site/24399669063dw3hc.pdfIn PDF document text
    • http://sovuxofi.66ghz.com/basic_electrical_electronics_symbols.pdfIn PDF document text
    • http://trujillostacoshop.com/arithmetic_mean_questionss6p8y.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tugumeb/joomla_3._x_free_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/beats_studio_2_wireless_headphones_manual.pdfIn PDF document text
    • http://tegemikewik.rf.gd/ranuzawuxav.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/23051217814.pdfIn PDF document text
    • http://jonapepubenej.epizy.com/bulloch_telephone_tv_guide.pdfIn PDF document text
    • http://gapisoga.rf.gd/libros_de_fisica_para_universidad.pdfIn PDF document text
    • http://tutufot.rf.gd/78522304225.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/64660070704.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/xulivijadolanetufekifowoz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD452 5556 bytes
SHA-256: cb4e8407cf0493cab39052e2b0db94a12fd2fb0abab7141e19e0c7946d972dea
font_01_sfnt_off0000e720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE720 13492 bytes
SHA-256: 0250352e34943fde1ddea53b21b90a0f81f5698cb446f0b8d3a19426504e7376
font_02_sfnt_off0001102d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102D 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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