Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b583d2ecbdc1c37…

MALICIOUS

PDF

85.8 KB Created: 2021-02-15 11:59:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd3f973f1865d0d9b20a80b9e8f969a6 SHA-1: 958a5353b9f7096b78d33f89ec010c04ed7fd7ed SHA-256: 9b583d2ecbdc1c3797040ec6e3982e7e29a40c48375cb7c563aefd149fead421
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a known malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly indicate malicious intent. The document body, though heavily obfuscated, contains text related to movie downloads, suggesting a lure to entice users to click 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/aws?utm_term=fifty+shades+freed+full+movie+download+in+tamilyogi In PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/pewofixiro-suned-lifetobabofane-wokekomira.pdfIn PDF document text
    • https://fikazimibugexu.weebly.com/uploads/1/3/4/5/134515259/fd2a458da0ae189.pdfIn PDF document text
    • https://fenatafu.weebly.com/uploads/1/3/1/6/131637570/4976346.pdfIn PDF document text
    • http://recepty-dd.info/tabudafupipubumutik1c8r.pdfIn PDF document text
    • http://drive4mclanemilwaukee.com/983295052631rz00.pdfIn PDF document text
    • https://zubefexer.weebly.com/uploads/1/3/1/6/131606337/ferevetoruze-terukipazevuwe.pdfIn PDF document text
    • http://ontrade.top/boss_and_me_theme_song7mmcz.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/kakef/67325940199.pdfIn PDF document text
    • http://pasazaxara.rf.gd/71575029932.pdfIn PDF document text
    • https://s3.amazonaws.com/tamovagag/avancemos_2_textbook_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gudukupir/yoruba_bible_jar.pdfIn PDF document text
    • http://roxutudutupit.epizy.com/pdf_read_aloud_app_for_ipad.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/kelanawunutixudereni.pdfIn PDF document text
    • http://gubodasitonobu.epizy.com/bsc_online_form_2018.pdfIn PDF document text
    • http://nuvipapijulabu.epizy.com/linusini.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_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 5532 bytes
SHA-256: 42387eb02de913b93146ddb04d6e27b5148024348ebf29c886578653b44a4302
font_01_sfnt_off00010a63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A63 11276 bytes
SHA-256: 713e1da0db7811f7e3905ce52112032cc541646ff0071e4e0e46a3828a72d7b1
font_02_sfnt_off00013109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13109 17052 bytes
SHA-256: ce7577937d280e32b3a228e1bcb3e7369e63c09f9b4c6aac1ae4f2e7219793d5

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