Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41d818ac8ecbe9c…

MALICIOUS

PDF

100.5 KB Created: 2020-12-31 20:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 074338bfb7d801adc763d46eebda7ed3 SHA-1: a16c841f45e51bd7133145a775d4b0efb8b66735 SHA-256: f41d818ac8ecbe9c548ebb7dbe9af976abb7dc8cf8ec9d6be2ee436bfb01ca3b
214 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or SEO manipulation scheme designed to redirect users to harmful sites.

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://gettraff.ru/123?utm_term=are+filamentous+fungi+multicellular In PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/kimosomixadex.pdfIn PDF document text
    • https://ralirepiputup.weebly.com/uploads/1/3/4/8/134852471/4145868.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/4086241.pdfIn PDF document text
    • https://widosutolitidaf.weebly.com/uploads/1/3/4/8/134847614/zexedumupo.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://uploads.strikinglycdn.com/files/3ffb9de2-f7de-478a-8f1b-86c0e44d1b9b/the_love_affair_2015_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8192e3-1d4a-4dd7-9087-47ab55466739/nba_2k18_mobile_apk_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b05b4a60-9903-4866-9c65-698f786a28d6/3717247921.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/62814850964.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee06fa5a-5e65-4923-8075-d2f7aa757259/xilasogakovinovesulixo.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/belezup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03338253-6f7f-4e3e-9822-8fcfcdf1a98f/sepekabubixodumiwujaruwap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d98df04-e5bc-406d-80f5-b0103f353f6b/best_knife_block_set_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b250f960-e313-4155-8e89-2f9a7e1ea53c/download_wallpaper_images_for_whatsapp_dp.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_off00013a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A16 5072 bytes
SHA-256: 0442ac5b217fb988e36f5bcfa9a6541523c09589d1bfa3f4443ee364e13d1448
font_01_sfnt_off00014b37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B37 14708 bytes
SHA-256: 6d59efe938266c536404d4e29130f6f166ba07f179722a6e9be7d8467134c863
font_02_sfnt_off000176a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A8 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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