Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d88028c2c95127…

MALICIOUS

PDF

77.5 KB Created: 2021-03-12 20:28:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 22740466b42c8efba5ef28736a0b10c1 SHA-1: 00318ab55a500244260f88446f751ee5cee64175 SHA-256: 31d88028c2c95127091f44df08538dfd3e48712edf54aaffb82a78e601b7a263
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, many pointing to cloud storage services and other domains, suggesting a link farm or SEO poisoning attempt. The primary malicious URL identified is 'https://jacksth.ru/123?utm_term=android+games+free++full', which is likely intended to redirect users to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://jacksth.ru/123?utm_term=android+games+free++full PDF link annotation
    • https://vamalogobiw.weebly.com/uploads/1/3/4/6/134696595/narizuxovejakedot.pdfIn PDF document text
    • http://selozufuwadapuw.66ghz.com/esoteric_bookstore_sydney.pdfIn PDF document text
    • https://jatomotubaw.weebly.com/uploads/1/3/0/7/130739460/2577334.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/mofarazipidax.pdfIn PDF document text
    • https://zenerabu.weebly.com/uploads/1/3/4/8/134870876/lunavi_rofekijizalav_jinab.pdfIn PDF document text
    • https://gisijenoxumo.weebly.com/uploads/1/3/1/4/131437849/8876246.pdfIn PDF document text
    • http://benodemutuvi.22web.org/renaissance_art_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/xiteduva/hhfW1if/wevukanedutavivuxuvu.pdfIn PDF document text
    • https://cdn.sqhk.co/manowipete/niag0he/7537460900.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zijivevip/apheresis_guidelines_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/59872740807.pdfIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/poe_fractured_wall_guide.pdfIn PDF document text
    • http://bofametif.rf.gd/back_formation_examples_in_arabic.pdfIn PDF document text
    • http://sakelukaje.epizy.com/6159510.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/hiwin_cad_model.pdfIn PDF document text
    • http://woxebolinos.rf.gd/how_to_use_brother_hc1850_sewing_machine.pdfIn PDF document text
    • http://mujijebal.epizy.com/cardiff_sixth_form_college_number_of_students.pdfIn PDF document text
    • http://xadogugatu.epizy.com/student_information_sheet.pdfIn PDF document text
    • http://bomapogixojepo.epizy.com/hobart_mixer_d340_replacement_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/tetenifeme/fumebafesasekepuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d0cb8bd-2eb9-4fd1-8b48-358613f623b7/kotters_change_management_theory_in_nursing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20551beb-f7fc-4e1a-b028-e5965d1ea3c6/77406863008.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e66d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66D 5020 bytes
SHA-256: 331b9cdc09d7ce77b98b0ca3413bf62f17542f61ac696f7558e1d3bfa905800f
font_01_sfnt_off0000f75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF75A 10252 bytes
SHA-256: eefcc56df2687e6f4a191c7603f89b10ae506b1128e3b2e97a32c0928f8aeb84
font_02_sfnt_off00011a94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A94 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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