Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0ecabacc08a758…

MALICIOUS

PDF

71.4 KB Created: 2021-03-22 19:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ed51377666c351eefa4064097fb7e5a5 SHA-1: b79c129c4d7f2a3cbcf8f83919fe8603beb179cf SHA-256: 9f0ecabacc08a7585adec7801fb6ff4004bd09721b0c00cafc4776bfb0902482
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://baarspo.ru/123?utm_term=ib+biology+lab+report+chromatography PDF link annotation
    • http://mowogaw.mypressonline.com/62237417782.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/fofodemilede.pdfIn PDF document text
    • https://bewepuxajijasi.weebly.com/uploads/1/3/4/3/134362307/2e3dc5085b35cc.pdfIn PDF document text
    • https://leresidatebij.weebly.com/uploads/1/3/0/7/130776374/pamanuneg.pdfIn PDF document text
    • http://ruwazumusef.scienceontheweb.net/mastering_bitcoin_second_edition_download.pdfIn PDF document text
    • http://revilokepudidu.mygamesonline.org/32716918359.pdfIn PDF document text
    • https://niniteju.weebly.com/uploads/1/3/0/8/130814631/wefazisajusuje_kelojagijosixu.pdfIn PDF document text
    • http://vegofejolafud.mygamesonline.org/pigabixovijodujil.pdfIn PDF document text
    • https://rulotukipaka.weebly.com/uploads/1/3/0/7/130776525/juterajojitogunu.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/69f0cea1-9c3f-4936-bba6-92c14ebc32a7/xulebaditapiparen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29733b5b-d67d-4429-94cc-ed67c1fd21c3/educational_psychology_for_a_school_teacher_with_real_classroom_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b5be14d-8e47-438b-830f-25ec89d2f163/diwapozobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef44c30b-a28e-4d00-96d5-2e59766edad1/fexuguxowat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ecae3459-d9ce-43b1-a764-fc4ac8d27909/40031138537.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6017e2e3-6d10-4d68-85a4-c7993e17ec8a/q-see_qt_view_pc_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2cf2c06-bfab-4855-affb-f3b21593df69/motorcycle_repair_stores_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5233d6d-f0dc-448a-a522-aa90c6831c7f/how_many_calories_a_15-year-old_need.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13cc902a-812f-4395-823f-65a3d770aeba/migoketovamikog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1634df29-e8bc-416b-8762-f44acde6ee72/nikon_p510_price_in_pakistan_olx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eeb57f08-2678-4cee-96f0-0857537e5832/79227035803.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_off0000d88d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD88D 5348 bytes
SHA-256: b5ce702ba0db9a31e7614f73e4f34345dda8c2e48f24f2478595114642f3e1d0
font_01_sfnt_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 10552 bytes
SHA-256: 3b46fe66b7c68fd31b0492fe4c46648befb53549b3ce450847136ccea2837b16