Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d6e0c2d09c820b…

MALICIOUS

PDF

69.2 KB Created: 2020-12-23 06:31:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f642b6ec98b03a0aea463e17e9fd8fd9 SHA-1: 2785a9660b28589d43967d5b2461659c6e8dbae3 SHA-256: b1d6e0c2d09c820b911f33956d0ef15f56962f443ccfda04e8e126f07f0fd4c0
222 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for a PDF redirector link and a link farm. The ML classifier also strongly indicated maliciousness. Although no scripts were extracted, the presence of embedded URLs and the 'SE_DOWNLOAD_BUTTON' heuristic suggest the document's purpose is to trick the user into navigating to malicious sites, likely for phishing or to download further malware. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=cozy+town+merge+game In PDF document text
    • https://vodiwisilob.weebly.com/uploads/1/3/2/6/132681054/d4bfde9d3f9444.pdfIn PDF document text
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/zevugegudokidator.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421468/normal_5fc8eb6f319df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5f9b1ce12cef8.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/6017d689-2706-4a23-a8a0-33e0e6e36ae1/8018377757.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e6c119-a19b-4034-ab5e-25fc7b90fce8/matchmaking_monitor_wows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46403bcd-c092-4062-8a98-bf2794454eff/98906871921.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b125b9ff-8566-4896-92da-020e7c94fe7f/mebazolikos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a93037d6-46c3-4717-8b81-a34a3695c353/51318022857.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/private_school_uniforms_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8190866-9217-41bd-8870-a7c3c2b17253/astute_in_a_short_sentence.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/79016881762.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0C 4944 bytes
SHA-256: 92c1703aac400e288ab4a45777d821975df7267c4e9aefe328c4a09e40c17402
font_01_sfnt_off0000cde3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE3 10768 bytes
SHA-256: d56aee7bae78bdb1fcee86b45a2c980de7debafea75f00ed8745969ef14bc463
font_02_sfnt_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

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