Malicious PDF — malware analysis report

Static analysis result for SHA-256 377ef4321a6239e9…

MALICIOUS

PDF

79.2 KB Created: 2021-03-09 10:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5b73c439168b5f2a4c982f2bb2a7e769 SHA-1: 237dc8d2fa9333f074f904e1217017d06e8ac981 SHA-256: 377ef4321a6239e9f5e098ef7b5267ad3323a794f5b5328d8667e1119d8d4a74
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and redirect to malicious infrastructure. The heuristic firings indicate the PDF is a link farm designed to redirect users to malicious content, and ClamAV detected it as a phishing trojan. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an intent to deliver a malicious payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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=ls-dyna+keyword+user%2527s+manual+version+971 In PDF document text
    • https://pikoxujedogusu.weebly.com/uploads/1/3/4/6/134665618/5311249.pdfIn PDF document text
    • http://fogexiduk.22web.org/93353274898.pdfIn PDF document text
    • https://vaxatimiroxak.weebly.com/uploads/1/3/4/6/134617636/xexutofofemaxe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379221/normal_600b46c416720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_60343660ee42a.pdfIn PDF document text
    • http://dezurifu.iblogger.org/what_qualities_should_a_principal_have.pdfIn PDF document text
    • https://posajegodat.weebly.com/uploads/1/3/4/4/134477503/merirenak-sikaloxiwi.pdfIn PDF document text
    • https://sugulidan.weebly.com/uploads/1/3/4/5/134508933/modezevexa-fumeg-xasolemobubiwog-gudone.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/be3b5f07-efb8-4134-92d9-5aae71a9b45a/parts_of_ship_engine_room.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d88d3d4-e1a5-4287-bf9a-dee6ea13c80c/2018_subaru_forester_2.5i_premium_manual_transmission_for_sale_pennsylvania.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0baef1f8-01e2-4566-8336-2fa719282fbf/40_book_challenge_recording_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/108ee982-7597-4cdf-802f-1551af817445/samsung_galaxy_note_3_price_in_pakistan_whatmobile.pdfIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_bab06a4a0a5e4064a817e53977c10a9e.pdf?index=trueIn PDF document text
    • https://c3bb11cb-ba02-405d-8462-2b4421b436e1.filesusr.com/ugd/4c7814_e2a9b97a50c3450d8c6483f0eba9bbdd.pdf?index=trueIn PDF document text
    • http://nukigisadowuwe.rf.gd/34162159836.pdfIn PDF document text
    • http://rutozaduv.epizy.com/dolowutakerugivunokobom.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_f242a82be8104c5ca50cde07cae3e7d8.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_54f26972787a4016a6c9b8464337ca44.pdf?index=trueIn PDF document text
    • http://tagitefidunun.epizy.com/wovezinukuseverofibosun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/440bb55f-6770-4845-b2be-20a42742fdfd/vijirozunimigupax.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_off0000f625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF625 5584 bytes
SHA-256: ac40503e99077710dbbaadf9beee6b1ca7135228b32190a461b2351f5be998e6
font_01_sfnt_off00010949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10949 10956 bytes
SHA-256: f1e269c2e92fd491c0839e6ea5df00a94e20416ed229471fa4b1ed09e09ff107

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