Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f196a5c65e7164f…

MALICIOUS

PDF

65.4 KB Created: 2021-02-07 22:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9647e9bfd8aac2dcf2ab6a46c49493d2 SHA-1: ef4e3637c396bfe2ae108f8c5d53f87618a071e1 SHA-256: 4f196a5c65e7164ffc7dbc70fd16c960aca15bf95f84421b2c709dcbb4cab674
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to lead users to external, untrusted content.

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://yafferge.ru/123?utm_term=direct+vent+propane+wall+heater In PDF document text
    • https://joxejiduzimomad.weebly.com/uploads/1/3/1/3/131383973/76ce5dd.pdfIn PDF document text
    • http://momivegod.22web.org/22._integumentary_system_crossword_puzzle_answers.pdfIn PDF document text
    • https://bexoxofimimiwox.weebly.com/uploads/1/3/0/7/130775405/4011b04f20f1a9.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/dakigazawufim-zunobosirewu-gimisuzevod.pdfIn PDF document text
    • https://sesifubonimexa.weebly.com/uploads/1/3/5/3/135317238/tanogof_sokomekasijez_vewawejixase.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/watajive/21020807607.pdfIn PDF document text
    • https://s3.amazonaws.com/goneduzum/answers_in_genesis_vbs_2018_music.pdfIn PDF document text
    • https://s3.amazonaws.com/dixaleko/kofejupawavatufa.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/jonutamalif.pdfIn PDF document text
    • https://s3.amazonaws.com/jifesu/katy_perry_songs_bon_appetit.pdfIn PDF document text
    • http://pugegexu.rf.gd/5058395263.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/narrative_report_global_handwashing_day.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/trasformazione_da_centesimale_a_sessagesimale.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/angular_directive_template_attribute.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/healthy_and_unhealthy_food_worksheet.pdfIn PDF document text
    • http://lujonas.rf.gd/adjective_and_adverb_worksheets_for_5th_grade.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_off0000c4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A8 4996 bytes
SHA-256: 8af8c042400808c50fac0196018d2145e73ca09f256c22eb8f4c097c883f8ef6
font_01_sfnt_off0000d5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BB 10304 bytes
SHA-256: d7ac94de7ef829e1016c4f660c3e2874f356e5e59dfd39c4b4c0fa1e9629e563

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