Malicious PDF — malware analysis report

Static analysis result for SHA-256 acfbc54842116c89…

MALICIOUS

PDF

100.4 KB Created: 2021-04-10 19:53:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b3536edcfa796bba26eccfe4a04cb58e SHA-1: 78f68537cb67e391b91b180af33e7f4f102c3644 SHA-256: acfbc54842116c899736fc61d2e8708510a7b7691a8f2dd8eefb181f5d8de1af
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ML classifier strongly indicate malicious intent. The document body, though heavily obfuscated, appears to contain metadata related to search terms, suggesting a lure for users searching for specific information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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=canon+650d+battery+life+video In PDF document text
    • https://cdn-cms.f-static.net/uploads/4505159/normal_6052fcce20944.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452386/normal_5ff9782d3160f.pdfIn PDF document text
    • http://zagavexakagin.mypressonline.com/advanced_brazilian_jiu_jitsu_techniques.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493245/normal_606315f78c033.pdfIn PDF document text
    • http://keruvimuvom.22web.org/gangsta_s_paradise_soundtrack.pdfIn PDF document text
    • http://jabofedu.sportsontheweb.net/car_accident_checklist.pdfIn PDF document text
    • http://kajipim.mypressonline.com/25555248666.pdfIn PDF document text
    • http://megesodore.iblogger.org/blog_post_template_hubspot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_6065728bcc2b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_600a598dab1f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377114/normal_5fe0ea7b8fa66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463262/normal_5fcb4df87cb6e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wemaxoseni.myartsonline.com/teacher_job_application_letter_sample.pdfIn PDF document text
    • http://xuduzunubedi.rf.gd/jay-_z_empire_state_of_mind.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/fedex_kinkos_printing_coupon_in_store.pdfIn PDF document text
    • http://rurasikawasup.epizy.com/interview_questions_for_leadership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/237d56d6-509b-4532-b8e5-771d8d94babf/what_happens_at_212_degrees_fahrenheit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/534b52f4-5c48-4eaf-9dbd-639a2ed16986/jililuge.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/vabufumubolupiwozuro.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/cochlear_phone_clip_reset.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_off00014544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14544 5352 bytes
SHA-256: 7ca7f850b3d9e1d3f14c3cb60137712da3cede259794e8ac7d0c6cef27d3a7cf
font_01_sfnt_off0001578c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1578C 12656 bytes
SHA-256: aba0e5c618143d293e8d4c8f72cb10e89e5cc024715c4320e9fd8f0e85476924

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