Malicious PDF — malware analysis report

Static analysis result for SHA-256 41aeefb589d2b58f…

MALICIOUS

PDF

66.2 KB Created: 2020-11-25 19:48:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 24bf00925b80619be00e1c7db6ab3cce SHA-1: 2d790748def80355f5addadb901d34047656f3be SHA-256: 41aeefb589d2b58fedf099d74c88445a344a0faab7cba8ec05545ff660454ffc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly-hosted PDFs, indicating a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution attempt, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://trafftec.ru/strik?utm_term=hazel+park+schools+superintendent PDF link annotation
    • https://vabuxijipureg.weebly.com/uploads/1/3/4/4/134476882/liveju_wosozovomiwosoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f8c5cab7ef83.pdfIn PDF document text
    • https://wekijoborumotis.weebly.com/uploads/1/3/4/4/134484899/7759d4a84e5.pdfIn PDF document text
    • https://gokipeko.weebly.com/uploads/1/3/4/3/134351508/pezimolujuwogen.pdfIn PDF document text
    • https://remewizefo.weebly.com/uploads/1/3/1/8/131856163/texobo.pdfIn PDF document text
    • https://bumilumijoxaxuv.weebly.com/uploads/1/3/4/4/134497753/mukirorume.pdfIn PDF document text
    • https://dujodorenenap.weebly.com/uploads/1/3/4/4/134488447/8302915.pdfIn PDF document text
    • https://jigusamimuwu.weebly.com/uploads/1/3/4/4/134435445/932798.pdfIn PDF document text
    • https://pefikasulanak.weebly.com/uploads/1/3/4/3/134350375/4319400.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_5fb5c0b8cb2a0.pdfIn PDF document text
    • https://mekuluvuxagol.weebly.com/uploads/1/3/4/5/134589608/tiwusafula_tebug.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/kudufigunabi/servo_motor_arduino_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/expected_salary_interview_question_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/2767254372.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/bully_game_guide.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_off0000c843.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC843 5236 bytes
SHA-256: bb97c17e620793cd35e8f320d4fd44ad52a5f54f9bc8874bb5d432b4c5f1ea20
font_01_sfnt_off0000da10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA10 9980 bytes
SHA-256: e93ccaa2f142786110707b19be8c69b1a5ccba81ff0417e3a032c3ccadc18d9a

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