Malicious PDF — malware analysis report

Static analysis result for SHA-256 9099fc90c5bbf979…

MALICIOUS

PDF

85.4 KB Created: 2021-02-10 17:09:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cff81bf59604d39cbf75ea5a85f2732d SHA-1: 904f1136875f52770545abd07ed26d4dcce78316 SHA-256: 9099fc90c5bbf979bff3d68cd793dbb09e3c68b61039b70a837baa7045c8b990
222 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=chandigarh+police+recruitment+2019+online+form In PDF document text
    • https://fevuxutub.weebly.com/uploads/1/3/4/1/134131759/63618dca16b997.pdfIn PDF document text
    • https://rixikevepu.weebly.com/uploads/1/3/1/4/131408169/wetejulu.pdfIn PDF document text
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/1226727.pdfIn PDF document text
    • http://spain50off.info/financial_astrology_books_freeillcx.pdfIn PDF document text
    • http://pemutoguxo.66ghz.com/liferay_themedisplay_in_velocity_template.pdfIn PDF document text
    • http://bred-enligne.com/enrique_iglesias_bailando_mp3_downlotiipk.pdfIn PDF document text
    • http://gallery-shop.site/vewowimuletulamupr33h.pdfIn PDF document text
    • https://ganegekisawaji.weebly.com/uploads/1/3/1/4/131406809/bikeguwir.pdfIn PDF document text
    • https://notaxivarem.weebly.com/uploads/1/3/4/6/134633458/77edf617.pdfIn PDF document text
    • https://gojajegu.weebly.com/uploads/1/3/6/0/136050346/kazusavosen.pdfIn PDF document text
    • https://kekugijofer.weebly.com/uploads/1/3/5/3/135321092/fatajufez_ruwosobabevegep_dowukudotako_gosej.pdfIn PDF document text
    • http://prizinsta24.site/mejor_antivirus_para_android_gratis_sin_publicidadylftt.pdfIn PDF document text
    • http://probmake12.xyz/adidas_us_to_uk_size_guidemxiur.pdfIn PDF document text
    • https://simofegike.weebly.com/uploads/1/3/1/6/131636923/6303044.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://s3.amazonaws.com/bulozor/goalie_equipment_size_guide.pdfIn PDF document text
    • http://saxefixuk.epizy.com/fodujazenowokikizetab.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/set_adapter_in_fragment_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zubuwujoxom/40913810428.pdfIn PDF document text
    • https://s3.amazonaws.com/kosipefojaw/cyclohexane_most_stable_conformation.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF98 5776 bytes
SHA-256: 21c52ed7755a3f2cf545528a446099d5839f64172932254350c5f7bad7d3e920
font_01_sfnt_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 11144 bytes
SHA-256: aa2c9365b95eed5523cd8e2e2f768e520d7f82d73081a0f68908785e4aad8942
font_03_sfnt_off000134b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B7 5032 bytes
SHA-256: c3a03e01d9e1bf12c479904b96d7ef625549407a15066f8b06814a3b208cbc2a