Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca1a8743185626e…

MALICIOUS

PDF

146.0 KB Created: 2021-02-09 21:57:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4cdfde3dd06c7226741c8af27b3c7571 SHA-1: d616a5805347ba92cf6f8d79c980c57821af1b19 SHA-256: cca1a8743185626e2871fb94e8b92c49aac5f68340d7657f42371617c070ebd3
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. It displays a fake CAPTCHA, a common lure to trick users into executing embedded content or downloading further malware. The presence of external URIs, including one pointing to 'bologen.ru', suggests a download or redirection attempt. While no scripts were explicitly extracted, the PDF structure and the fake CAPTCHA heuristic strongly indicate an attempt to exploit the user's interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://bologen.ru/123?utm_term=diehard+battery+charger+manual+71221 PDF link annotation
    • http://frut-tree.site/bidart_campos_derecho_constitucional1y5jn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_601bcf52be367.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/6mNihzh/baby_growth_spurts_symptoms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427781/normal_60216f71e84a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_60090976bfa8f.pdfIn PDF document text
    • http://arbitestpark.xyz/4_pics_1_word_onlinerua6n.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/iahhi1L/dirt_racing_go_kart_for_sale_near_me.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/nowonovege/64640585478.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxuledo/68337052284.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/adb_console_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/vakevaresuripo.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/ramalo.pdfIn PDF document text
    • https://s3.amazonaws.com/tanapilamaxi/bird_alarm_tone_for_android.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ddb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDB9 5680 bytes
SHA-256: 095648ebe1463e4597a5e3e161fcf4ba4558e9c013810be0d6549a2dbf499bd8
font_01_sfnt_off0001f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F101 15272 bytes
SHA-256: bed311c1261f02f31244ea70f0c680e75ea304b17835a656ecad1960a8671f21
font_02_sfnt_off0002236e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2236E 16428 bytes
SHA-256: 9c99dbec487b6733cf1b8bd27813f32cf9110127646ba7cdda4a7cb9b81e4bb7

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