Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e3a25f0caaceb43…

MALICIOUS

PDF

72.8 KB Created: 2021-04-17 07:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ada3d5df1b8832df3fc95f32eae3ac29 SHA-1: 1f81847d62fc9b90fdd1fc92b5e0085abcbf2827 SHA-256: 9e3a25f0caaceb430c6e9e2dbab61c03031d0283102e6c5de8b21f0dcd248858
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'conceptual physics worksheet answers' to trick users into visiting these malicious sites. The presence of external URIs and link farm heuristics indicates an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ponafet.ru/strik?utm_term=conceptual+physics+worksheet+answers PDF link annotation
    • http://kebuwakuje.medianewsonline.com/manual_of_botulinum_toxin_therapy_2nd_edition.pdfIn PDF document text
    • http://bewizasosu.sportsontheweb.net/95689193765.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376098/normal_5fec44cd6640c.pdfIn PDF document text
    • http://pufivuziviv.mypressonline.com/64219309394.pdfIn PDF document text
    • http://tivuximuliku.mygamesonline.org/47499901390.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/14087057182.pdfIn PDF document text
    • http://potawuzaj.medianewsonline.com/descargar_mapa_turistico_bruselas.pdfIn PDF document text
    • http://zowogusatutojus.mywebcommunity.org/girezaxejakamut.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/90024117013.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369796/normal_5fe1cfd950638.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/carl_sagan_pale_blue_dot_free_download.pdfIn PDF document text
    • http://pazefezos.mywebcommunity.org/99595657441.pdfIn PDF document text
    • http://pogawubujogeje.mypressonline.com/26_week_money_challenge_5_000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385648/normal_5ff3f591df7f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501037/normal_5feeef25a0615.pdfIn PDF document text
    • http://tozofuji.scienceontheweb.net/27761364342.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/kugubugumesesekiluw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_605efc4de804b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://64e1471b-64f8-4582-b127-b1692805dd1b.filesusr.com/ugd/507a3d_d3c2e0b08ad24490a9c8922c092652b9.pdf?index=trueIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_3d4966b8a9a341cead25f362097fef8d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/bujozuxed.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/37554223478.pdfIn PDF document text
    • http://seroritubofa.atwebpages.com/biomedical_waste_management_and_handling_rules_2020.pdfIn PDF document text
    • https://f8b57e9d-e272-4783-b6f5-6420e6b93425.filesusr.com/ugd/886b73_3c7c69841c5d40ed98b9c77e7cb1b688.pdf?index=trueIn PDF document text
    • http://rukosivujuxu.atwebpages.com/spiritual_meaning_of_numbers_601.pdfIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_510e0683ced7418c9bb5e1776d66d764.pdf?index=trueIn 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_off0000e34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE34C 5184 bytes
SHA-256: 5561bfe8c05bfad0cfdb657aa1c9cb778849292c40c52066546ac0c7c1651f30
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 9572 bytes
SHA-256: 7f7344ae1543789c7e9c800fd31a9e45ad9e50866a22247ab5aeaae6c05bee2f