Malicious PDF — malware analysis report

Static analysis result for SHA-256 d378d84738f59a70…

MALICIOUS

PDF

69.7 KB Created: 2021-04-18 02:52:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c94c15a21c1f4a1152ca29c77c2f8ca5 SHA-1: 22deca3355fee511fe2c389ebfb5ee486232fed9 SHA-256: d378d84738f59a70883ebccf68118d0aec44bcddc8168ee863f7412d8f3a53c1
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing or social engineering lure. The PDF is also flagged as a link farm on disposable hosting, further supporting a malicious purpose. No scripts were extracted, but the presence of external links and the overall detection profile point to a phishing attempt.

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://golowaki.ru/strik?utm_term=social+psychology+11th+edition+myers+pdf PDF link annotation
    • http://mosdendy.store/101050663152ottt.pdfIn PDF document text
    • http://uablog.website/39566628294r82pv.pdfIn PDF document text
    • http://magnetfix.store/jadupupelovilebugofej3v3tn.pdfIn PDF document text
    • http://wutanumijejol.sportsontheweb.net/67849653657.pdfIn PDF document text
    • https://mitukuruzatag.weebly.com/uploads/1/3/5/3/135346955/domawiradefopen.pdfIn PDF document text
    • https://zarojapejafaro.weebly.com/uploads/1/3/5/3/135347044/tupirotetu-filikixil.pdfIn PDF document text
    • https://titobabedax.weebly.com/uploads/1/3/4/3/134317276/4513966.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec92088-720a-4d49-a95d-55977fb42d49/fulukoru.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/abia_state_polytechnic_post_utme_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/826ccac0-fadb-4de6-b79c-d3048746ff40/niwovafukufinijipejiwitij.pdfIn PDF document text
    • http://vajapojaperusu.myartsonline.com/2020_calendar_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/stephen_king_books_list_of_all.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0cf1e37-b2b6-447b-93b9-21fa6f28d02b/64449932160.pdfIn PDF document text
    • https://s3.amazonaws.com/liwara/baumanometro_manual_que_es.pdfIn PDF document text
    • http://zuzopejorexa.onlinewebshop.net/zunowuvuzeziladeduketeso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd12108c-4487-4dcd-9444-a7f3accb87f1/ford_ranger_uk_service_intervals.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/dofesiweziwikir.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_off0000cff3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFF3 5824 bytes
SHA-256: 6d5efd9f325448e7d0716f9e7a5e76273f6a1cc987cfc6476cda67f96d064f9f
font_01_sfnt_off0000e3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A9 10856 bytes
SHA-256: 29c2379d48491fcd6728b893cce88b2573702b9fd68c31725d18421b1ee0c291

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