Malicious PDF — malware analysis report

Static analysis result for SHA-256 507b15dc7e960b33…

MALICIOUS

PDF

73.3 KB Created: 2021-03-27 12:41:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9a031259487127d91f699a13aaa3f92f SHA-1: 606551af858f18295dd380ae9601a2c00c84c70e SHA-256: 507b15dc7e960b3381905fc7bbf33a961ebf790f73a7246ca68c5cfcaef3c539
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to suspicious or unknown domains, indicating a link farm or redirector strategy. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM firings strongly suggest the document's purpose is to direct users to malicious infrastructure. While no scripts were explicitly extracted, the nature of the embedded links and the ClamAV detection as Pdf.Phishing.Trojan suggest a phishing or malware distribution attempt.

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://yafferge.ru/award?keyword=compliance+audit+checklist+pdf In PDF document text
    • http://putojujoxojiri.iblogger.org/rumozalapebejejitel.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://golomashvanna.xyz/learning_to_drive_a_car_step_by_steptvuz5.pdfIn PDF document text
    • http://barashik.space/42312783084om00s.pdfIn PDF document text
    • https://xegiduburap.weebly.com/uploads/1/3/5/2/135294675/546d1815f8b9b.pdfIn PDF document text
    • http://nesorus.mywebcommunity.org/lodofurulis.pdfIn PDF document text
    • http://dupamineni.medianewsonline.com/rana_catesbeiana.pdfIn PDF document text
    • http://dvestideyli.xyz/pumupafemimcsl5.pdfIn PDF document text
    • https://pukakiliratof.weebly.com/uploads/1/3/4/7/134768090/voxafasamuvo.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/guvovigo/65095409888.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58aca76c-17e0-4146-89b1-3ad30f918d55/playman_summer_3_java_game_dedomil_net.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/gtt_test_normal_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa2b04d0-dff4-46d9-a688-02690e605667/43220564887.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/adobe_illustrator_business_presentation_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/castor_informatique_math_2018.pdfIn PDF document text
    • http://rabuwupitakif.rf.gd/vmware_horizon_client_mac.pdfIn PDF document text
    • http://gozudivigel.epizy.com/94850878212.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/talk_like_ted_carmine_gallo_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fda83c2f-2e2c-454e-976b-e26912ac6df8/73291487852.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_off0000e29b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29B 5268 bytes
SHA-256: 76a792db2e6cccf85dfa1b64859cea18b7a1af957e350401b81a78cbeebca81f
font_01_sfnt_off0000f45b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45B 10404 bytes
SHA-256: ba631a4834284a114bb5a72d9c26846e2eda8a917710d6c74885414182e0eb72

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