Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05d747c085781d9…

MALICIOUS

PDF

78.8 KB Created: 2021-04-07 14:45:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 900f0ab992a26a78910a758403b6b6fd SHA-1: ecb5c23006f64ad1eea08494f5c29dab41e4eff3 SHA-256: b05d747c085781d941cbb061b966109c4a1f379aa1219ee5baf182eabe574d09
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with multiple external URIs pointing to potentially malicious domains. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. The document body, though heavily obfuscated, contains text related to 'vocabulary workshop' and 'answers pdf', aligning with a lure to a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=vocabulary+workshop+level+c+unit+14+answers+pdf PDF link annotation
    • http://worozoxiw.sportsontheweb.net/xiwesopelorotafenabet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379855/normal_5fe30902f1ca5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_601867ac85756.pdfIn PDF document text
    • http://coolvdomaion.online/lg_refrigerator_service_centre_contact_detailsn8vhg.pdfIn PDF document text
    • http://warupipujamoru.sportsontheweb.net/14556004739.pdfIn PDF document text
    • http://cosmosqrab.online/tomorrow_when_the_war_began_season_2_release_datezyvog.pdfIn PDF document text
    • http://sozapemogoz.mygamesonline.org/furisesewavojakobiduniwa.pdfIn PDF document text
    • http://padojobimo.mywebcommunity.org/gukefomidozipebo.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/alU7giA/64605956992.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474449/normal_5ff06e44dc0c4.pdfIn PDF document text
    • https://cdn.sqhk.co/zuxafopagad/hhhdAjh/zujepuvujibobesigo.pdfIn PDF document text
    • http://anarchymedya.com/80588758404iezvs.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385863/normal_5fceea572c3f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://misanedajog.myartsonline.com/rufidunibunofununuz.pdfIn PDF document text
    • http://lixugafepujijoj.onlinewebshop.net/ziguwemawanekum.pdfIn PDF document text
    • https://s3.amazonaws.com/sitok/supinatarivuw.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/44731902377.pdfIn PDF document text
    • http://rotufixijisadi.onlinewebshop.net/kalimba_tab.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_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 5808 bytes
SHA-256: c2763f2a7c94aa19d12995dfbaffcc576bbce420bfc702e8569c3c98c9fd9984
font_01_sfnt_off00010b57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B57 9496 bytes
SHA-256: 05dea3cb61beef1cb9cc16272f65ddb0864dd4c858059444128b97aa696a6722

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