Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc253337e9af5d5c…

MALICIOUS

PDF

76.7 KB Created: 2020-12-08 08:09:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 143c34786adc515a9ef4905e0621b0be SHA-1: 7fe2fb9d73d039ab165f13f64a44a4b1e4f0f2e5 SHA-256: cc253337e9af5d5cf1315d855f38e0054fc77b86a87b9637e96ca24c1a37344b
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, with at least one identified as a malicious redirector. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to potentially harmful content. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?utm_term=casio+ctk+1000+manual In PDF document text
    • https://xowogibudul.weebly.com/uploads/1/3/4/4/134446034/tepofevexosuma.pdfIn PDF document text
    • https://godosofebi.weebly.com/uploads/1/3/4/6/134651625/vanawubiravirawomama.pdfIn PDF document text
    • https://zadumeredevasax.weebly.com/uploads/1/3/1/4/131453870/2511032.pdfIn PDF document text
    • https://gemamiji.weebly.com/uploads/1/3/4/3/134372226/a0efd17.pdfIn PDF document text
    • https://nijubalalo.weebly.com/uploads/1/3/1/4/131453980/zopifoxeke-sorepopunilosiz-vumapetewi-vedonewogofako.pdfIn PDF document text
    • https://bajekilirevi.weebly.com/uploads/1/3/4/8/134868337/kitosedovusukos_tomodumevalogo_budasejof_latat.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/dutimajizowa/crop_rotation_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cf6ba23-edac-4566-9c4c-9b71d34761a9/statistics_for_business_stine_foster.pdfIn PDF document text
    • https://s3.amazonaws.com/vasofirida/act_dates_for_2020-21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3892c407-e69f-4277-9a98-87b3bcbcdc23/kuduzus.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/zatixixelafigarimudejete.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/mee6_bot_commands_discord.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/87781049021.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000dd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD23 8272 bytes
SHA-256: 961c814f63ff26edef4d1f01014b38ba4934aea459a71e36b01f2240b99ae147
font_01_sfnt_off0000f28c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28C 5012 bytes
SHA-256: a9770ea19a1ae3cff67b6ab0acfd78f2402065cac6becef5b00fb5a082637444
font_02_sfnt_off0001038b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038B 10176 bytes
SHA-256: adf56d6228349480300e04274ccd43f020bc47f8f38bd13de062c1e621a6322a

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