Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb22280710dd9b7…

MALICIOUS

PDF

70.0 KB Created: 2021-02-27 10:16:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17e86d6d21d4b6803542c0a7420356a3 SHA-1: 476e413d71206e0ac1aa291fb37b13ba0f01d341 SHA-256: efb22280710dd9b7aaf6f590ca3f93922db802258ab920266dec6b60229d8652
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are likely part of a link farm, as indicated by the PDF_SEO_LINK_FARM heuristic. The presence of a download button lure and a critical ClamAV detection for 'Pdf.Phishing.Trojan' strongly suggests a malicious intent to trick users into downloading malware. While no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lozipotod.ru/wix?keyword=rock+player+2+apk
    • http://bebetadiruj.mywebcommunity.org/consejo_de_participacion_social_seph.pdf
    • https://zikixitifo.weebly.com/uploads/1/3/4/8/134897390/sojaji.pdf
    • https://cdn-cms.f-static.net/uploads/4470837/normal_5fd393407ff5b.pdf
    • https://pawasisuleti.weebly.com/uploads/1/3/4/6/134652657/wuxuvinutodaxolese.pdf
    • https://cdn-cms.f-static.net/uploads/4381321/normal_601d26edd0fad.pdf
    • http://mujabelor.mywebcommunity.org/resumen_acto_2_el_si_de_las_nias.pdf
    • http://puvepum.getenjoyment.net/58779085537.pdf
    • http://gapagal.mywebcommunity.org/csr_corporate_social_responsibility_in_india.pdf
    • https://belinadojo.weebly.com/uploads/1/3/1/6/131607131/1678602.pdf
    • https://static.s123-cdn-static.com/uploads/4472479/normal_5ff97dde9c689.pdf
    • https://static.s123-cdn-static.com/uploads/4463560/normal_5fc6f5f138242.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wobanunep.myartsonline.com/difference_between_ocr_omr_and_micr_in_tabular_form.pdf
    • https://s3.amazonaws.com/mafavuzenoliki/41644534901.pdf
    • https://s3.amazonaws.com/teximikamukubo/enumeration_of_coliform_bacteria_in_milk.pdf
    • https://s3.amazonaws.com/dezajok/block_list_app_for_android.pdf
    • https://s3.amazonaws.com/kibavutibeved/osha_approved_forklift_training_video.pdf
    • https://s3.amazonaws.com/dazovosugev/performance_appraisal_form_filling_tips.pdf
    • https://s3.amazonaws.com/dukexajuj/91624453186.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d574.bin
d41b6f43395ba080cf308164e2451f2152ad8e18378f7227e1249b56aef336dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD574 5056 bytes
font_01_sfnt_off0000e6cb.bin
52a4f340c576889504392b03fd5b6d9354bcc32de4a9316d05c0e4f46217124b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 10656 bytes

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