Malicious PDF — malware analysis report

Static analysis result for SHA-256 75a78366c99a0c99…

MALICIOUS

PDF

76.9 KB Created: 2021-03-21 23:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: af1fd39db10e92a32991cfeb078fd9de SHA-1: e1c6f8de28752256098c54f9f7b12c1cb1884086 SHA-256: 75a78366c99a0c99e560b380ef0bd16cf15a7a2dc9f792f53c85485e98d71647
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/strik?utm_term=ma+rmv+permit+test+book PDF link annotation
    • http://findattime.com/best_animation_apps_for_pc_freezj3xx.pdfIn PDF document text
    • http://profit-makers.club/775587226105nns6.pdfIn PDF document text
    • http://hhizmet.com/3081635835745jd7.pdfIn PDF document text
    • https://runumoviw.weebly.com/uploads/1/3/4/8/134854062/29b39f5bf442.pdfIn PDF document text
    • https://mugevodotigo.weebly.com/uploads/1/3/0/7/130740084/7639203.pdfIn PDF document text
    • https://damujulul.weebly.com/uploads/1/3/5/3/135335913/7a4917d248abd.pdfIn PDF document text
    • http://vegekezivujid.22web.org/cbse_class_12_sociology_notes.pdfIn PDF document text
    • https://zubosevofugojat.weebly.com/uploads/1/3/4/3/134307347/vuxoropog.pdfIn PDF document text
    • https://sivesasa.weebly.com/uploads/1/3/4/6/134669324/2371078.pdfIn PDF document text
    • https://wiguvufa.weebly.com/uploads/1/3/0/7/130775639/2411039.pdfIn PDF document text
    • https://molukubiluvu.weebly.com/uploads/1/3/1/4/131453067/258d5.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/pidonaligurosazu.pdfIn PDF document text
    • http://romomikas.22web.org/37960127720.pdfIn PDF document text
    • https://jeraligasusuwaj.weebly.com/uploads/1/3/4/5/134528446/ropikisesi.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/mawesenasijoser/jejubovilazan.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/good_books_for_7th_grade_book_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/how_do_you_fix_a_furnace_that_wont_start.pdfIn PDF document text
    • https://s3.amazonaws.com/waxapoz/android_version_pie_release_date.pdfIn PDF document text
    • https://s3.amazonaws.com/najipavez/25638677068.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/how_much_does_it_cost_to_fix_apple_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/4th_dimensional_transition.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/19539144921.pdfIn PDF document text
    • http://dadixuxizu.rf.gd/54740877953.pdfIn PDF document text
    • http://katufimeg.rf.gd/learning_arduino_code_language.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/break_even_analysis_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/dasijosexaverejanaxolage.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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 5204 bytes
SHA-256: d5071216b241a309777f64d66e353f1d14e6d26227fb8de4a55b1de7b2b2c824
font_01_sfnt_off0000ff8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8A 11300 bytes
SHA-256: e0b78dcbe72ffccab172b59fd6dfa242c5db0c8c3c3f6a941e8960c5c00166e8

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