Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac427f9b480755ee…

MALICIOUS

PDF

80.0 KB Created: 2020-11-26 09:26:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: ec2bbc1781b770967699f28b62455c1d SHA-1: 8dfd85dd5c316b4830c42afeab8593b21819ee4a SHA-256: ac427f9b480755ee2ae39d3f85295f22e5d1ac87540ee2790b4c16f5680d5ff8
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, and contains links to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to be a lure related to a school calendar. The presence of numerous external links suggests an attempt to direct users to potentially harmful content or phishing sites.

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://ggtraff.ru/strik?utm_term=palm+beach+county+school+calendar+2018+to+2019 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_5fabad0fa2bd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387406/normal_5fa192e3c44d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446158/normal_5fa38b3aa40d7.pdfIn PDF document text
    • https://ramogowerutamu.weebly.com/uploads/1/3/4/4/134488443/fenirokilir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483837/normal_5fbcece9dd5ce.pdfIn PDF document text
    • https://lefasibemaji.weebly.com/uploads/1/3/4/5/134589759/luzamobavofisiniz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417119/normal_5faa3dfb81437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367667/normal_5f8c870e17924.pdfIn PDF document text
    • https://tijogarukaro.weebly.com/uploads/1/3/4/7/134710746/zajitidinokav.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5fb521c172503.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/jonora/liwogefunenajosatirese.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/big_debt_crisis_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/lajapifaposipeles.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_off0000f923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF923 6096 bytes
SHA-256: 168fce3493c379de641815ae67a8189658c325ab33fcadacd0e3102ba00ffb58
font_01_sfnt_off00010db5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DB5 10740 bytes
SHA-256: 315074b6193d9a6f03030f9f8f9caa86c902240b14227a13885d6962e85d6580

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