Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6decef88531366b…

MALICIOUS

PDF

101.1 KB Created: 2021-03-23 00:09:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9ffc781813145fdd3c0d8eb9ce10ca0a SHA-1: 2601d3339c0673a6ea38348051938ecaea77e731 SHA-256: b6decef88531366bf21fddaf29b74dc9164b4a8be0ad6bf5b84d3ed191d14c10
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=what+is+the+biblical+meaning+of+number+605 PDF link annotation
    • https://zasawebisev.weebly.com/uploads/1/3/4/8/134865024/6986482.pdfIn PDF document text
    • http://choosemadam.site/zumakafhf20.pdfIn PDF document text
    • http://cherrypimp.online/89571598885iyxe4.pdfIn PDF document text
    • http://bluebadgeapproval.com/walmart_pre_black_friday_2020_flyercn8zp.pdfIn PDF document text
    • http://shopwithsale.website/judita0fset.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/5338157.pdfIn PDF document text
    • http://honbiz.pro/11830609182y9fwi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/79646bfe-3a2a-4bed-aede-3ed337f14c5b/how_to_determine_volume_of_cylinder_in_gallons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/060965cb-9b76-4a99-b5d8-ac0d88d8cf24/17781255229.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59f84ed7-8257-4499-8adf-466e609cc74f/que_es_autorretenedor_de_impuesto_sobre_la_renta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c2927d4-1818-4f1c-b97b-06dfede6dd47/download_hp_designjet_500_driver_for_windows_7_32_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad701fd-2428-4688-a59a-1df1487a5e59/koxomuwurudirigogoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b43543f1-8deb-4141-840d-dd9eb78e7bba/57740311221.pdfIn PDF document text
    • http://radizala.epizy.com/mod_survival_knife_leather_sheath.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63448ed-9728-4ed2-b194-031d2750e332/are_star_trek_books_any_good.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfec3f24-ec15-4475-a3dd-c06f1ab64223/43779974939.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5135c0e2-4e75-44b3-9a0f-e76e9284982c/how_to_operate_mazda_remote_starter_switch.pdfIn PDF document text
    • http://taguramol.rf.gd/pefubozoletubupafobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a0affe7-37fe-419d-b61d-519303fe6500/mujuvinagepeg.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf3736d-f2a1-447b-b14f-1d9b38b701b9/python_class_example_code_github.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 5868 bytes
SHA-256: f6d6c03606ad9aa8bfeb54363cac6e72f27867113e0c4b40ce2fd963dffa727e
font_01_sfnt_off00013fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FA0 15080 bytes
SHA-256: ee214f230e533576d2dee7f007f9440353a57c3b33f09ab105e48310e6487d17
font_02_sfnt_off00016f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F77 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501