Malicious PDF — malware analysis report

Static analysis result for SHA-256 754d16cf6516b895…

MALICIOUS

PDF

72.9 KB Created: 2021-03-10 01:22:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 44c358b5df868da227e5c83da5a6fd75 SHA-1: 2ce8e2392a71e99d4c6bc1d53b7f304bc1970aca SHA-256: 754d16cf6516b8959909ab67edf102be03024fea496dbd57014e62e711302c57
214 Risk Score

Malware Insights

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

The PDF file contains embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malicious redirection attempt. The document body, though heavily obfuscated, contains text related to 'Hdfc bank aptitude test questions and answers pdf', suggesting a lure to trick users into clicking the malicious link.

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.
  • 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.
  • 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/award?keyword=hdfc+bank+aptitude+test+questions+and+answers+pdf In PDF document text
    • http://ragofilud.medianewsonline.com/fomufotezuzukabegul.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/mention_the_generic_structure_of_recount_textljcf6.pdfIn PDF document text
    • http://lonotel.mygamesonline.org/xawifakukisupa.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/45969568365.pdfIn PDF document text
    • http://lizowaw.scienceontheweb.net/face_360_mask.pdfIn PDF document text
    • http://crysety.xyz/72542275442v29xl.pdfIn PDF document text
    • http://frasqen.online/nukibabakafutugul1muy.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/debamijizozexo/wallpaper_hd_for_android_mobile_legends.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/filing_false_police_report_nc.pdfIn PDF document text
    • https://8dfdba76-182f-4dc4-9dda-37a8c8d09dc9.filesusr.com/ugd/4ae4db_d9210e0429784acead77f2710040da71.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/08032045-f3ce-49f2-86d2-ea41ed61feb4/87230366513.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/zagududiz.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/resume_format_for_sql_developer_fresher.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/avengers_desktop_wallpaper.pdfIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_c1c84615900c47078682dc27fe794ee8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fobupojowojon/hypixel_skyblock_co_op_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3689a2b4-aff8-496e-aed6-a965a1e0189a/fofodiwabalo.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/colligative_property_questions_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kigavanus/motor_accidents_compensation_act.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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 5500 bytes
SHA-256: 07a3e7984c05d2f9972b042b2f96f187c1762821cb3a99ba7da968c4ab342f7f
font_01_sfnt_off0000f1cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CB 10716 bytes
SHA-256: 23205d82493ba763f0cfb81e7245f7c600b82573093a40d677cb8ef3d359868e

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