Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ccd6093931fe2f…

MALICIOUS

PDF

83.8 KB Created: 2021-04-15 14:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4207132f9d895e8f3f95a0ebf9148c89 SHA-1: c939927c4c76bdf8712e43305dbb65fad1021d2d SHA-256: a0ccd6093931fe2fecfd532ec152370edcd5e094cbd8d7763974ab7a9cfb318a
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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://pelibifir.ru/strik?utm_term=the+beautiful+and+damned+lyrics PDF link annotation
    • https://cdn.sqhk.co/nozedimasav/aieT3BP/boba_tea_house_menu_riverside.pdfIn PDF document text
    • http://gevenukodujojov.getenjoyment.net/wurekupedokifotasekefo.pdfIn PDF document text
    • https://cdn.sqhk.co/losomilodip/eigic2X/samsung_split_unit_air_conditioning_system.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/answer_key_for_math_expressions_grade_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/508e529d-daa9-4561-964b-6d9826d7e5fa/gadofapujijod.pdfIn PDF document text
    • https://s3.amazonaws.com/zakunafu/bepidasexijugezezinow.pdfIn PDF document text
    • https://7abbf572-6989-4614-8246-9d5ba34cd238.filesusr.com/ugd/af841b_995de1bbdec840c5abf448f6a08caf4a.pdf?index=trueIn PDF document text
    • https://dca540c6-954d-4243-9f09-0921753db957.filesusr.com/ugd/974a4e_12a53de9c2eb40538f853bae0ba85de0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/02ee34ae-9730-4744-9752-bc769cde8657/living_on_one_dollar_a_day_worksheet_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/autoskillz._net_critical_ops_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8c3322-e856-4e61-91ee-0598fd778243/how_to_write_spanish_sentences_correctly.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/safety_and_health_for_engineers_3rd_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89b7c60b-5e3a-4ff5-9fe4-8445e6ea981f/zoxemi.pdfIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/gonofazojas.pdfIn PDF document text
    • http://jukasuxoseki.atwebpages.com/88688077192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f66811-1633-468f-b334-b037b9b20ee5/5489805296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22f8c6a5-000b-48b5-b877-79b45ccb0fdc/xuzapejofujezafabur.pdfIn PDF document text
    • https://964beff5-d24f-450a-94e2-fa7e9faef44a.filesusr.com/ugd/61158f_a67f90c7025848bc915f6944bffa2d6e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/16215443624.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e15cc9-ebe1-49d0-a0f2-71381ea2ea2d/goput.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_off000109eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EB 5452 bytes
SHA-256: c41af43d4dae87f73077f0b65f1eae1f7d3dc4258a4845405c1bf99ca9f72973
font_01_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 10980 bytes
SHA-256: 5432b05c528ea08e041b5a879555e4a0dbf77aa2c0b5e897db5c7a3cd1e85e14