Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56fb952d5b6e944…

MALICIOUS

PDF

83.1 KB Created: 2021-01-11 08:49:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 011442f8430a28fe3e5829efa83c715e SHA-1: c0e90118db6f1f01d5cec6258669f5e8c8b09d50 SHA-256: d56fb952d5b6e944e9a749a9c468a52ab863541a744915c585cfec756762dc5b
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to service templates, consistent with phishing or malware distribution campaigns. No scripts were extracted, but the presence of numerous external links strongly suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://cctraff.ru/aws?utm_term=certificate+of+service+template+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4475582/normal_5fae1816d2e1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405925/normal_5fd0770449b0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_5fbf0da78e1cc.pdfIn PDF document text
    • https://site-1175775.mozfiles.com/files/1175775/wanagediroloxagivukizexe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450421/normal_5fa000b4d1e49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366956/normal_5f8c4d57bd4f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5ffbcae9e88e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380881/normal_5faa53e182c15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_5fa0efbdd2eda.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/mOidZjf/tawetamipuvokowiba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_5fe77e5530a95.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/bb427ecff126227.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f91934e88139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_5fa1de669ddd3.pdfIn PDF document text
    • https://site-1166621.mozfiles.com/files/1166621/50129858938.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 5188 bytes
SHA-256: f063ae3084e2812e2031cd864d1b0bc732a6ffc5d83b460e02d9e93d897732fd
font_01_sfnt_off00011b48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B48 10584 bytes
SHA-256: 17ed32d824f78b0a88bedd9fde84e59a7b3594ed7854258cc9ffc70e84ac7379

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