Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e9f54e88b63005…

MALICIOUS

PDF

75.2 KB Created: 2021-04-29 20:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7ddc3c243531ee3a221298b5d7f01b0c SHA-1: 83a0947be7fa65f6274643ecaf47c06b8283b308 SHA-256: 88e9f54e88b63005f0789795c579a5426c7d813f63505b5f5d4f5ffaa4deff68
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM', with one prominent URL being 'https://resalured.ru/strik?utm_term=life+fitness+elliptical+machine+repair'. This suggests a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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 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.
  • 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://resalured.ru/strik?utm_term=life+fitness+elliptical+machine+repair PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402964/normal_60678f711df60.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/oxford_word_skills_vk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417025/normal_5ffe621ca14b4.pdfIn PDF document text
    • http://ranupila.mywebcommunity.org/aladdin_broadway_musical_script.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fdc8115ce6ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pusixa/51506071849.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_88131e7e319a43aa877dc229c29e06ba.pdf?index=trueIn PDF document text
    • https://656adf98-7a81-40bd-8d0f-2b9c27d09201.filesusr.com/ugd/268ab1_a966b0d6cd814990b0b15bda46a7c4cf.pdf?index=trueIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_4f4454f6feb64a7cb9d8babdd08642b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wofaxil/beginning_basic_english_grammar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80b4dc58-c006-4273-be6d-cc891f3de04e/75711612768.pdfIn PDF document text
    • https://b1c30c75-ab46-439a-884d-3836ae4b8a49.filesusr.com/ugd/2d1648_9d38c2b9af714f6a81a4f23a1a7cc0e6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/givogukel.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/linezozirorigeri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ea9ba5-e054-4c66-9155-d85f8100d28b/uniden_bc355n_scanner_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe87ad3-218d-44d6-8ea9-71ce8333d898/husky_1800_psi_pressure_washer_parts_list.pdfIn PDF document text
    • https://488c2ff9-9ff4-499e-8f11-525115e20b22.filesusr.com/ugd/8aba0c_b35314372b8f45279678e88209009304.pdf?index=trueIn PDF document text
    • https://d5bea983-5bca-41ba-aae6-6b688785cc77.filesusr.com/ugd/9ec29b_d5e71e5db8a643a2a270aab4974cf3c6.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_off0000e785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 5196 bytes
SHA-256: 83bd57d32c3be0cd26c3346543802c995eb7e50c12a6e37e314e3b7bcf0feea5
font_01_sfnt_off0000f90d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90D 11216 bytes
SHA-256: e14d315428004bd247a382e9c8594f21cf6fa586c2058dfd42d77ca1f748c166

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