Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f39f769db28ad7…

MALICIOUS

PDF

91.9 KB Created: 2021-02-15 19:33:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: c24b82558a5185426fcd57f45b837597 SHA-1: bb5332ec73cceb3da558c01fa0cc88b269dfee9d SHA-256: 82f39f769db28ad7478cd0f046ace4096827314590ea70b637f2f4175a197957
162 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded URLs and the redirector suggest an attempt to lure the user to a malicious site, aligning with spearphishing attachment tactics.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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://yafferge.ru/strik?utm_term=ie+irodov+questions In PDF document text
    • https://cdn.sqhk.co/feripamapuv/6K1PPbf/the_sims_freeplay_apk_data_download_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/dign2gd/car_payment_calculator_with_tax_tag_and_title.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421611/normal_5fc9014b18861.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384469/normal_5feb548312839.pdfIn PDF document text
    • http://detonic-shop.website/orientacion_y_tutoria_1_secundaria_santillanazdwd6.pdfIn PDF document text
    • http://arm-watch3.club/69381583495k66zr.pdfIn PDF document text
    • https://cdn.sqhk.co/bidusowo/ugeihM5/car_driving_simulator_2018_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nobixapo/fd0gdha/baby_shark_costume_diy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_601023bf5a663.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410694/normal_6001e1f6e0a9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454163/normal_5fd72f1c760ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471238/normal_60102054babb7.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/xapidajovaji/catalina_stuck_on_estimating_time_remaining.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/hitman_blood_money_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/ninulujibawekedorelema.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_off00012c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C2C 4700 bytes
SHA-256: b0b17878a08c8b450853ddf0041f9362b4398afe5c220a199d17018fa188ff5c
font_01_sfnt_off00013c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C3B 11368 bytes
SHA-256: 11014caf442c47922766fd6858901d59953de95180cb5bd9a75a04b9f2347a27