Malicious PDF — malware analysis report

Static analysis result for SHA-256 52accdd8ecb682b5…

MALICIOUS

PDF

69.0 KB Created: 2020-12-26 22:28:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2b2404a2d6e6847c0fa3ea9bdda7601c SHA-1: 5a0867bbf54b76bbdbfe3e51c0b793980c64dc56 SHA-256: 52accdd8ecb682b5c802df7ec3ffeaae5a38266526cfae52f402af3795934a52
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It contains a significant number of embedded URLs, with one identified as a known malicious redirector. The presence of a link farm suggests an attempt to manipulate search engine results or distribute malicious content. No scripts were extracted, but the overall structure points to a malicious document likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=air+jordan+4+retro+premium+pinnacle+snakeskin In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367007/normal_5f93886b53ac3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426280/normal_5fae023155d07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5fd17dbf390d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383930/normal_5fa3ba6fc6fba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_5fad46687ade1.pdfIn PDF document text
    • https://vipapesad.weebly.com/uploads/1/3/4/3/134369303/medovezawapum.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_5f8e4281cd90b.pdfIn PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/4903429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453105/normal_5f9f41dd929d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416921/normal_5fba963330fc3.pdfIn PDF document text
    • https://xaxiduxaze.weebly.com/uploads/1/3/5/3/135308656/1130374.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375890/normal_5f8e89e1a7ee1.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/susopuzupure/rectangle_png_image.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_off0000cd40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD40 5436 bytes
SHA-256: 5666bd097dda602da5738d5f35e9113797aaa98ce7e357420b425856981fd968
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 11052 bytes
SHA-256: 8c6d9886d8dacbe2705c6ff56ba87ff49f7615b576929e8d23c37c44a1ee6bbd

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