Malicious PDF — malware analysis report

Static analysis result for SHA-256 66cc365664a1ca41…

MALICIOUS

PDF

81.6 KB Created: 2021-03-21 00:18:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e0fb15aa8210fc021162776413dfcd4b SHA-1: b093324bfdf34c14400f9c403b2681d1cd29944d SHA-256: 66cc365664a1ca41463b12ea765028dc37999268d6b0d1f2b0c382bfd9227d89
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services and are likely part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/award?keyword=bsc+nursing+syllabus+pdf+baba+farid+university PDF link annotation
    • https://cdn.sqhk.co/pigexebobe/X7Cgfjf/new_york_giants_live_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/wediximewoza/jic3jeW/pizisutakewijog.pdfIn PDF document text
    • https://cdn.sqhk.co/bosareke/ekFy3je/msr_pocket_rocket_stove_kit_vs_jetboil.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/rT3jdlU/vijusosebeti.pdfIn PDF document text
    • http://closemaze.com/xaximusimalomupoxaxofeno4mv3a.pdfIn PDF document text
    • http://instapriz365.online/jodur4j6fc.pdfIn PDF document text
    • http://health-top.ru/what_does_virgo_in_jupiter_mean0xq8r.pdfIn PDF document text
    • http://rent-nout.site/3631817508617sjy.pdfIn PDF document text
    • https://cdn.sqhk.co/lagusive/mXjdsIh/kusefuwalezijolujubidipab.pdfIn PDF document text
    • http://shopsupergood.site/41720120025ikqo6.pdfIn PDF document text
    • https://cdn.sqhk.co/sadebupunen/hdjhyQG/alien_apocalypse_costume.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/ifo13hi/amma_baby_images.pdfIn PDF document text
    • https://cdn.sqhk.co/nazutupim/jgfnjaW/naken.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/03e6cf9e-0e32-4564-ba60-aebab42c700d/medio_de_comunicacion_mas_usado.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/cloverdale_spray_paint_msds_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/sesafefanulokam/14216514040.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/nedusaji.pdfIn PDF document text
    • https://ecab545c-19d2-4654-b6ac-fb8b9749f5ba.filesusr.com/ugd/e5412a_d532d15864ae437e81becb5f0a85b616.pdf?index=trueIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_0dbf5c6f8a9440bf8562854e045abe51.pdf?index=trueIn PDF document text
    • https://107a3552-ed21-4f5d-95e3-510b6eae4444.filesusr.com/ugd/21bbef_6432bad3e6684754b78aec817ffb6492.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/diboda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba34c99-41cb-41a0-b851-4b0a6c8475fb/90868802583.pdfIn PDF document text
    • https://s3.amazonaws.com/nuruvapozixix/rilerasudesubowowovoraso.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_off0000eaf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF0 5676 bytes
SHA-256: f752f6a1b3670b085def3a5bb7bba33ce5ff0f7cfbeb26f3737091b4a8df314e
font_01_sfnt_off0000fe60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE60 10736 bytes
SHA-256: 22c91425f156c38761014d6af9d566c3cb63a173f58d630eb253638b9855a173
font_02_sfnt_off00012336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12336 5200 bytes
SHA-256: cdfdda3daa523b0b7f4c34df773f3e0c57ec25e3dfa09b8aceb59e460335b9b0