Malicious PDF — malware analysis report

Static analysis result for SHA-256 af2ca0bdd94e190c…

MALICIOUS

PDF

75.2 KB Created: 2021-03-25 04:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 04c3806acbc780c157a1a74013997a97 SHA-1: 1fa8d3a5004bdd9158a688c32604fb442a0a35ec SHA-256: af2ca0bdd94e190cae5b5dadd8e2389a9d0cbbc25d54090072e5113ed734568d
214 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to potentially malicious redirector infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' indicate a strong attempt to direct users to harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

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
  • 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://crophysi.ru/strik?utm_term=how+to+speak+english+fluently+fast In PDF document text
    • http://kihepc.xyz/dimensional_analysis_problems_worksheetup4q0.pdfIn PDF document text
    • http://mon-cmb.best/devajoramiximoy226.pdfIn PDF document text
    • http://sikazigazes.mypressonline.com/aide_mmoire_composants_lectroniques.pdfIn PDF document text
    • http://gapagal.mywebcommunity.org/30548313786.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/46111469142.pdfIn PDF document text
    • https://cdn.sqhk.co/kutajanode/5ij2SLw/jikumiwiworapakavivat.pdfIn PDF document text
    • https://cdn.sqhk.co/bodegife/Egdgjha/factory_format_for_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/causes_of_ww1.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/bussid_indian_livery_apk_latest_version.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/free_hot_work_permit_template.pdfIn PDF document text
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_17e2b547a8104bd3a5bb11d697f345a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/fancy_text_pro_apk_mod.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_1cffd841e14a4a72b67b5fb183cfd910.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sifawekujiki/mebivatexeledejimipil.pdfIn PDF document text
    • http://bixozebaxikapos.atwebpages.com/castrol_magnatec_diesel_5w40.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/66478840915.pdfIn PDF document text
    • http://tikeresepujel.onlinewebshop.net/change_to_jpg_converter.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_off0000ea42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA42 5288 bytes
SHA-256: a8e40cd79f4340bdcd8fae82684ac8b0f22fc601a71b93a8d733a7845240b2ee
font_01_sfnt_off0000fc5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5E 10476 bytes
SHA-256: f9ab465e739f67e71923908ad0839011bba01bc36b176ea9f7d877f952c1fc5d

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