Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dbb1b744fca87e6…

MALICIOUS

PDF

77.1 KB Created: 2021-02-23 16:57:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3c4f27721be42ac125f1d96778d38b4b SHA-1: a291de0bded87b5c46b9adecf0f81d76aa7316bf SHA-256: 3dbb1b744fca87e65c2a385b7820db840992ed600e7028910e149d21ed36f575
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to 'Realtek hd audio manager' and software, suggesting a lure to trick users into clicking the malicious links.

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=realtek+hd+audio+manager+windows+7+not+showing In PDF document text
    • https://cdn-cms.f-static.net/uploads/4491969/normal_5fe799b7c937f.pdfIn PDF document text
    • http://chestlune.online/theory_of_computation_objective_questions_and_answersj71hz.pdfIn PDF document text
    • http://apple-fruit.space/how_to_set_code_on_kwikset_smartcode_913vd3rw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455195/normal_601afa15a83f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453550/normal_5fc603acedd24.pdfIn PDF document text
    • http://yandex-delivery.cc/numbers_words_worksheets_grade_3976rh.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/ifFZvjh/chess_pieces_moves_cheat_sheet.pdfIn PDF document text
    • https://pekatube.weebly.com/uploads/1/3/5/3/135393066/6560797.pdfIn PDF document text
    • https://xubibedizu.weebly.com/uploads/1/3/1/4/131454459/juzin.pdfIn PDF document text
    • http://vash-fasad.live/classroom_behavior_management_plan_template0oxya.pdfIn PDF document text
    • https://sajabewegapin.weebly.com/uploads/1/3/4/5/134592402/821e40ffa7e.pdfIn PDF document text
    • https://cdn.sqhk.co/lagitesavap/LgejieB/ridivusinobesaxurul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5fe713c42f1a6.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/zgcHKha/rovojosixifosoxi.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/fizup/indian_oil_sustainability_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kakekojezutok/filmyzilla_bollywood_movies_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/nabaterigunuze.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/unbreakable_android_tablet.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/91193974436.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_off0000ef89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF89 5480 bytes
SHA-256: a39db42c816d2c5514bbbefa7af3d076cf439ea7730aea4dab43f4b0c59531b2
font_01_sfnt_off0001021c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021C 10728 bytes
SHA-256: 9170be8f7b7526cff7db8cbff8235168c01d13317fc1e6f2d7a33c5dc1c9fba9

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