Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0ec22a5a0655509…

MALICIOUS

PDF

81.3 KB Created: 2021-05-27 07:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d0e9bca829a352da89cba280ac8bca49 SHA-1: 3ec5eae92295595aba07a5a5699502bf62fc9381 SHA-256: b0ec22a5a0655509f194ed537c94fdc20edb467e960e5bf85ce774926846e8d1
214 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, indicating a phishing or scam attempt. The embedded URL `https://crophysi.ru/strik?utm_term=filmora+for+windows+7+32+bit+offline+installer` is a primary indicator of this malicious activity. The ML classifier and ClamAV detection strongly support the malicious verdict.

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
  • 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.
  • 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://crophysi.ru/strik?utm_term=filmora+for+windows+7+32+bit+offline+installer In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387565/normal_6011dfa3864f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471512/normal_60431597d260a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423772/normal_5ff2f1f10a632.pdfIn PDF document text
    • https://kukonugaxa.weebly.com/uploads/1/3/5/3/135327287/263274.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5fdbcd973ef51.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369647/normal_6040712db49be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407313/normal_5fec7eb47e3b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457281/normal_6035b7222d358.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450746/normal_5fcd703d7414e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365652/normal_6022ade298c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445555/normal_6065d7930a81b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378857/normal_6043839ecc14e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404500/normal_60435091eb28c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_6035fde95f020.pdfIn PDF document text
    • https://gawokani.weebly.com/uploads/1/3/5/9/135993895/d708fc1b6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481552/normal_5fecd09439727.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/931827.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/39ab1e4d-6187-4c26-9e8e-33c0c2a634d9/what_are_the_23_most_common_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2943ff79-553b-41f7-8373-490136f0b4a9/mercedes_e320_service_engine_size.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 5404 bytes
SHA-256: eea072aec1849427045781f1d1314a8417efe731c8f70c3148d9b74417941909
font_01_sfnt_off0001022f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022F 11652 bytes
SHA-256: fcff7fc0cdbfbb5010a67d4d02c5ed0e0288a90ec73c22ed63dc2abb37399346
font_02_sfnt_off000129a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A1 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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