Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a142a58a91e8c70…

MALICIOUS

PDF

79.9 KB Created: 2021-04-18 05:37:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 43ecf01cf0183a2302a4a4d7acc62279 SHA-1: 6fe6bf40eb7068f44e8b2fa2475f4af2b6ccb2d9 SHA-256: 9a142a58a91e8c70fdbf42d2fa16b02ec2b46d3c6ce3a33ec01d530e20bd1ece
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to potentially malicious or SEO-farmed websites, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent. The embedded URLs likely serve as a lure to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://jottigo.ru/strik?utm_term=what+are+3+physical+or+chemical+properties+of+salt+water PDF link annotation
    • https://digutejuwunapon.weebly.com/uploads/1/3/5/3/135325267/rasebirabirolu-pidorif-vomemuva-vugoverorede.pdfIn PDF document text
    • http://bikejesoxatelo.mygamesonline.org/humminbird_fish_finder_for_sale_cheap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_606788168e5a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365545/normal_5fc64946d42f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5ff708867d8a5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_5fd8557a0765a.pdfIn PDF document text
    • https://detaxenenikub.weebly.com/uploads/1/3/0/7/130776267/parekugofetola-jefumaje-govabum-sepoledub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478137/normal_60154631c1a6a.pdfIn PDF document text
    • http://lewijufe.sportsontheweb.net/anda_filing_checklist.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/b40b99a1-710a-4ddc-891e-f1005d395ceb/zitumenibugibupi.pdfIn PDF document text
    • https://s3.amazonaws.com/fonazuzixagizir/11926860257.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09b89f71-ffff-43bd-afad-2c610af715d6/31549915978.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/42487250951.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/mcgraw_hill_connect_physics_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/67799650804.pdfIn PDF document text
    • https://s3.amazonaws.com/sojebelevenex/rmc_call_recorder_app_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d9c632-4464-4981-8fe4-330bfe345cd8/a_2.4105kg_airplane_is_cruising_at_900_km_h.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c370adde-1bc3-4b4c-afc1-f32766d6f3c7/strange_city_names_in_michigan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0308b3-70da-4020-8b2b-e1d3693efd7c/15679510388.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/the_art_of_kissing_back_wattpad.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/kadififadatojavade.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/zojukuleponuzudesoxo.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_off0000ea7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA7F 5308 bytes
SHA-256: c20ab60bcab4d16e0b6747d47fec16b4e6263915c7e31c1ee0f30403570023a1
font_01_sfnt_off0000fcab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAB 11184 bytes
SHA-256: 33ff1151a642b6cf17d55f090b32ee772c89d6022eb0c8c1ff44ca83181b5d6f
font_02_sfnt_off0001229f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1229F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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