Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab278bb9d2a79315…

MALICIOUS

PDF

65.4 KB Created: 2020-12-19 07:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 08ed679925a5a71f7e5d86a9499466b5 SHA-1: 1b11768606f114c8a6c13d39188dc8377edb34c1 SHA-256: ab278bb9d2a793150ee388b1a23eb541a81c90f728bb589ae7f97a85619b2fc9
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external resources, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK pointing to 'traffmen.ru'. Another critical heuristic, PDF_SEO_LINK_FARM, indicates a large number of outbound links, with the first being 's3.amazonaws.com/xozeb/pegaxojemumevapusem.pdf'. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or trojanized document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/strik?utm_term=unit+5+ap+world+history+summary
    • https://vizoxubo.weebly.com/uploads/1/3/4/7/134703389/6664315.pdf
    • https://dosedupuwosiwoz.weebly.com/uploads/1/3/0/7/130776272/8588809.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xozeb/pegaxojemumevapusem.pdf
    • https://s3.amazonaws.com/ratixifo/sagorupujomapisepemiseza.pdf
    • https://s3.amazonaws.com/fosalizuzu/cognitive_behavioural_therapy_for_ocd.pdf
    • https://uploads.strikinglycdn.com/files/ae0d2966-b900-4a32-aa1b-89ed0ebfc218/44910936918.pdf
    • https://static1.squarespace.com/static/5fc13e7011f6a4198487f639/t/5fcaae4588885701c6def4e8/1607118406510/85665146660.pdf
    • https://s3.amazonaws.com/dixaleko/what_color_is_your_parachute_workbook.pdf
    • https://uploads.strikinglycdn.com/files/62497bfa-bc66-4244-bb09-1567098c975e/kitinimeko.pdf
    • https://uploads.strikinglycdn.com/files/267716f3-b475-4c61-8e6e-f281c70d6dd8/sacred_geometry.pdf
    • https://uploads.strikinglycdn.com/files/3fb8cb18-1211-48d0-9f53-7b1c28f1c0cd/44374050061.pdf
    • https://uploads.strikinglycdn.com/files/f25cc648-b1ce-41b0-a9db-c34371500c0b/the_fountain_of_fair_fortune_universal_studios.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c456.bin
1deb76344dd2604d6f971bcb3c64568ccceca09953ce1bee0d35532d97960cda		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC456 5508 bytes
font_01_sfnt_off0000d703.bin
7044637c46180e733cd15b2a41546e8b447cfc87895800256f5ee757e95bb6ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 10044 bytes

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