Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b388b309450ffbb…

MALICIOUS

PDF

68.7 KB Created: 2021-03-05 12:20:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2ac4b704b8ffab31d636b1e6f75e59e0 SHA-1: a53a928b00b382147a590b00fd9d9320c971f31c SHA-256: 6b388b309450ffbb314d54852d45e781184e50c0c908f840719ceb21dababc6a
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. The presence of embedded URIs and the overall structure point towards a phishing or redirection attack, likely intended to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • 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://xajibur.ru/strik?utm_term=gnc+pro+track+ultra+instructions PDF link annotation
    • https://joxoxego.weebly.com/uploads/1/3/4/6/134664344/8858355.pdfIn PDF document text
    • https://cdn.sqhk.co/rarinuva/ihNhcpr/galaxy_m20_wallpaper_hd_download.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/jZih9Oh/63353042387.pdfIn PDF document text
    • https://puxasuzad.weebly.com/uploads/1/3/4/3/134352875/zumusawu-fekojanukikite-vufakukavofupuv.pdfIn PDF document text
    • https://cdn.sqhk.co/bivadudit/gdwifBk/8842757326.pdfIn PDF document text
    • https://gitokivoj.weebly.com/uploads/1/3/4/3/134316846/8875481.pdfIn PDF document text
    • http://nofovukad.iblogger.org/kotegilujurituno.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/wutezigojuxi/23024282003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cd0a22-586e-497b-84a0-9a59ac1ef40d/create_dynamic_json_string_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52110f7c-4e02-4d43-b669-11e5a2ea9b1f/xajezevubabojiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce48c369-a4c3-45b4-850c-0f10d22fc060/how_fast_is_the_axial_yeti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47c651c7-f17c-4ed9-96f5-69622b764593/time_management_tips_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/2014_jeep_grand_cherokee_srt_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e58f34b-86b2-4664-9b43-f75791661142/73482454076.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99cef19-0c4b-40c8-b1af-7a7c3b92c497/16143999812.pdfIn PDF document text
    • http://rubuvajaroxe.epizy.com/84905958121.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1bd10eb-0653-423f-8976-fb39126e35bd/ariens_snowblower_engine_backfires.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_off0000c3a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A5 4784 bytes
SHA-256: f9c3394754957210faaaeacdebd47b043986d615c6a80c1410cac9a3ba036171
font_01_sfnt_off0000d3ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EA 10600 bytes
SHA-256: ab86da7ae071bf17a71d2c5d4bae1f389d020efc89e9ff36be8907288d71f2c6
font_02_sfnt_off0000f7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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