Malicious PDF — malware analysis report

Static analysis result for SHA-256 19d02a79d13c2448…

MALICIOUS

PDF

74.2 KB Created: 2021-03-09 21:02:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: fee763497e3be98653e665dece2e4ec2 SHA-1: 92f96ddc07f8fe48faa7a922f5e9531c9e8af303 SHA-256: 19d02a79d13c244828cbeb9f0b5cfd09a1e3d756c9ccaeb9396bd6bc5ec4c71f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ClamAV as a phishing trojan. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a tactic to disguise malicious content within seemingly legitimate search results. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 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://zajinet.ru/wix?keyword=introduction+to+sociology+anthony+giddens+pdf PDF link annotation
    • http://richteam.site/reading_comprehension_passagesvx24t.pdfIn PDF document text
    • http://petrol-v-pol-price.site/problemas_de_calculo_de_volumen_de_prismas_y_piramides31eov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fcb8e8b6c4d6.pdfIn PDF document text
    • http://nabavawuzafurur.mygamesonline.org/what_does_blood_in_toilet_bowl_look_like.pdfIn PDF document text
    • http://mitisavad.getenjoyment.net/venixanipilosozurisugu.pdfIn PDF document text
    • http://subfamjtii.site/batogasemusifakuruvozibag2oe2v.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369322/normal_6001e488d18a4.pdfIn PDF document text
    • http://vipimuxatomefi.medianewsonline.com/criminology_the_core_7th_edition_citation.pdfIn PDF document text
    • http://idealica-uficialeitalia.website/bi_weekly_work_schedule_templatenw0ub.pdfIn PDF document text
    • http://tuwimig.scienceontheweb.net/xabiloza.pdfIn PDF document text
    • http://pidijajuwupurop.medianewsonline.com/new_audit_report_format_2020_icai_in.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366652/normal_603cf3892163a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/7382ad63-5d86-482b-97e0-cfea1847a225/doll_house_furniture_for_sale_durban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14a1a3e3-4a1b-411e-ae85-d4886fd9dbef/10167280035.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/muzasemesakedamij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5102da47-8aca-41b7-886b-313fc587243a/gusuriba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba23710f-8b58-403e-a85d-b49cf2be1e39/15972717443.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/85794239865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e583aba-b101-4b6e-be7b-40d8d9499825/dexenipewipapesawi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e717669-854a-4c72-995b-3b43887ba867/70020707914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4be134d3-74c2-4e24-81fc-8c9cd61744ab/london_baptist_confession_modern_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7be4f4ff-1be4-421f-9814-35cd0a3c62f7/68976560270.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/married_life_piano_sheet_music_letters.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD786 5340 bytes
SHA-256: 54b8f6b1a1f14a04009f5ec8c0c713ef0f8edce8c8507901650da515404a2c37
font_01_sfnt_off0000e9a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A9 10172 bytes
SHA-256: f6de62c3745fc2bbb9f2806827433c07354cf08cfc01caa5e3b1e9f1361497ed
font_02_sfnt_off00010c93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C93 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361