Malicious PDF — malware analysis report

Static analysis result for SHA-256 d851899b510bf955…

MALICIOUS

PDF

84.0 KB Created: 2021-04-16 03:33:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 8a4b2f23c6beaede0138b4f0174fbde1 SHA-1: 6f10f052d2d5d5367c647eaf826d3da491017d9d SHA-256: d851899b510bf955126acbe5a956ad7e9ca8b2baa915b9b5fcd7c8c565ce3d05
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://bologen.ru/strik?utm_term=metacritic+unravel+2 PDF link annotation
    • http://lagulesuko.medianewsonline.com/air_pollution_seminar_marathi.pdfIn PDF document text
    • http://rotirir.mypressonline.com/socioeconomic_determinants_of_health.pdfIn PDF document text
    • http://rebujewemiv.66ghz.com/forms_of_government_worksheet_answer_key.pdfIn PDF document text
    • http://kodatapipezan.22web.org/9290762251.pdfIn PDF document text
    • http://nuxokavarop.22web.org/nukofuzu.pdfIn PDF document text
    • http://sugegixojavuro.iblogger.org/26546476352.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jutagejefutix.atwebpages.com/technical_analysis_basics.pdfIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_b227f6c0136d4195bc5aa5e563ac98ca.pdf?index=trueIn PDF document text
    • http://pazipinabobon.epizy.com/word_meaning_book.pdfIn PDF document text
    • http://mewexudidis.epizy.com/jurnal_agorafobia.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_63fb0b26b360436ea21508e252aba5ec.pdf?index=trueIn PDF document text
    • https://a01f0313-f680-4530-87a9-ce77a10bb621.filesusr.com/ugd/ac0554_6d45b654ca564797beb74359b1f08b88.pdf?index=trueIn PDF document text
    • http://pobepogimivej.rf.gd/22857633956.pdfIn PDF document text
    • http://wasupedojewemo.epizy.com/tafsir_al_quran_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/20662156785.pdfIn PDF document text
    • http://turekepopede.rf.gd/xeginepekale.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/sample_argumentative_essay_for_middle_school_students.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/zonolopajosijazipenixevuj.pdfIn PDF document text
    • http://tuxefofoxomar.epizy.com/wazoperonolevelufukalot.pdfIn PDF document text
    • http://sajatuvireguta.atwebpages.com/introduction_to_anatomy_and_physiology_notes.pdfIn PDF document text
    • http://fodapimogu.rf.gd/46469164115.pdfIn PDF document text
    • https://s3.amazonaws.com/tobito/8040515519.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_d0b0af5a607846e988416f70c14826e7.pdf?index=trueIn PDF document text
    • http://panuvan.rf.gd/97841908643.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_off00010c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C19 4812 bytes
SHA-256: 69e5676abed8e07511724ed03a18dd7d6a1ceeb9ff3a097050043b9a96fc8f4f
font_01_sfnt_off00011c9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C9A 11544 bytes
SHA-256: 564672503759730d9cdefa92cf1b7e91945c56c7b641f080e0e0f098bdd595b9

Open this report in the interactive analyzer, or submit your own file for analysis.