Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf9d4c5d96ea52a…

MALICIOUS

PDF

67.8 KB Created: 2020-11-17 19:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 324cf387786a9518408e8d7af439a193 SHA-1: 596f34d1d2dbef137300d0ba2665e29ee193b294 SHA-256: baf9d4c5d96ea52a4dabf87ccf94d459fe73da57803c8730b73d3fc3d4c1a63a
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are identified as part of a link farm designed to redirect users to malicious sites. The primary malicious URL identified is 'https://traffine.ru/123?utm_term=common+core+sheets+understanding+ratios+answer+key'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://traffine.ru/123?utm_term=common+core+sheets+understanding+ratios+answer+key In PDF document text
    • https://zigudufojivop.weebly.com/uploads/1/3/4/7/134718002/6318937.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/mamilut.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/446cd6.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/niluja.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/5469818.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/9d40084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411500/normal_5fb3783fa3103.pdfIn PDF document text
    • https://latujajadaf.weebly.com/uploads/1/3/4/5/134593938/jazokonixokabejuke.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/minabiwa/66246778254.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/29806303880.pdfIn PDF document text
    • https://s3.amazonaws.com/sugaguxagu/81102979304.pdfIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/quantum_machine_learning_biamonte.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/wovevawelimu.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/kinh_ph_mn.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/raft_wars_2_game_to_play.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/uber_android_apk.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_off0000cba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA7 5484 bytes
SHA-256: 431fb28ff07713e7f19b21a1d2d8b4bb03a612e38cedb84ef915a64695792555
font_01_sfnt_off0000de35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE35 10676 bytes
SHA-256: 5dbe44cde1935ccf2f5885149ac4e2701fd3b2802ee0f915ed4f8a0d25803f5d

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