Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fafb769fae04d3c…

MALICIOUS

PDF

75.7 KB Created: 2021-05-06 02:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 0a7f8e94de20b820aec66afb649a5724 SHA-1: aa874ea574edede17d08122f38d01634a1a3737a SHA-256: 8fafb769fae04d3c9d4d8cbb6dfe37d0c86310d4e3ef3ccd5a66406b46e852c7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9992

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 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://dafemum.ru/strik?utm_term=dutch+grammar+book+reddit PDF link annotation
    • http://xokebidukefu.getenjoyment.net/autoestima_en_los_nios.pdfIn PDF document text
    • http://wupidubame.mywebcommunity.org/55582685526.pdfIn PDF document text
    • https://cdn.sqhk.co/bafaluminowi/qhijggh/lumuwuw.pdfIn PDF document text
    • https://cdn.sqhk.co/xalibolopov/P0cjiiG/auto_accident_lawyers_near_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370299/normal_6005219901835.pdfIn PDF document text
    • http://natbeach.space/club_car_precedent_beige_seat_back8p3dp.pdfIn PDF document text
    • http://xxlmature.site/romeo_and_juliet_act_2_summary_videoom8rv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444386/normal_606935345e0ba.pdfIn PDF document text
    • http://kasyanbeauty.com/bonomoditatanifinox7lx3.pdfIn PDF document text
    • https://cdn.sqhk.co/xovujiroveg/dgidjji/sewotumaxinugudebewolux.pdfIn PDF document text
    • https://cdn.sqhk.co/jagibuvat/bLGe88m/feist_let_it_die_meaning.pdfIn PDF document text
    • http://lotukaguw.sportsontheweb.net/where_to_learn_calculus_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kasuwajavi/aPkjjyf/73412306498.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471235/normal_6040b81dd66a5.pdfIn PDF document text
    • http://artyom.guru/miniature_dachshund_puppies_washington_state1rxrm.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/g9jfbXb/18948016344.pdfIn PDF document text
    • https://cdn.sqhk.co/demanajinu/fPihiu3/wisafi.pdfIn PDF document text
    • http://vajukadezazi.getenjoyment.net/formato_de_un_acta_constitutiva.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lopakesuzuw.atwebpages.com/high_blood_pressure_symptoms_and_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/individual_development_plan_examples_for_retail_managers.pdfIn PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/credit_report_dispute_lawyer.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/noninekimuju.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/minejazologilu.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_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 5344 bytes
SHA-256: e14c863f225436825ae2f3c8bbf6cf2da5197d6c83fbc55254e916a2b93ec74c
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 10672 bytes
SHA-256: 4fe87af47a1a93fbaee1dcffeb697ea9d10ee532b10aa02894f7a66123c3f4af

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