Malicious PDF — malware analysis report

Static analysis result for SHA-256 2128e5e5867026a8…

MALICIOUS

PDF

71.4 KB Created: 2020-12-31 00:11:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1c25fef5401730df2744b03c01c7d89d SHA-1: dfc6afc18c7cd8bf53cf9631b8388251390e09be SHA-256: 2128e5e5867026a8fa6949dadbdd9aff77535dc60fe11300462ff57f6fd68449
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to redirector infrastructure or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious redirector designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/wb?keyword=the%20roommate%20movie%20true%20story In PDF document text
    • https://cdn-cms.f-static.net/uploads/4454043/normal_5fc0c9915a96a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366040/normal_5f8719e8638c8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445866/normal_5fc66a5eed88e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464530/normal_5fec84906e6d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471514/normal_5fe76cb30a435.pdfIn PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/154220c96d39ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_5f9f15c4ef082.pdfIn PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/vemubeli-zesoguseboxe-segusotupiw-turatoxadaniku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/31e84803-6c1b-4f43-8821-8c27e916f1bf/shiness_the_lightning_kingdom.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/what_is_the_difference_between_heat_and_temperature_in_physics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee9adc9b-0919-4e15-b646-2c49fb84e592/53099345515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f549dd9b-1ebc-4287-989f-98adc4a787c2/diy_cardboard_file_organizer.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/video_to_gif_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/printable_worksheets_area_of_triangles.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE1 5004 bytes
SHA-256: 5e733b3383ac8c5528768936b034b54846c944877489302bd24789e7d7fe16d6
font_01_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 10248 bytes
SHA-256: 6fba8a6baf02d2239c451ec2990d205399aec5817d7465505569c6fe4990d500

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