Malicious PDF — malware analysis report

Static analysis result for SHA-256 adc81f43f5d53449…

MALICIOUS

PDF

76.9 KB Created: 2021-02-19 11:22:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5af1c33dd3c03ac747824b997c613914 SHA-1: 5b2ea7d5fcdbbbcd0fb75fe4352169171d61e883 SHA-256: adc81f43f5d53449f372a2d1987f535dc5e6ee4e2632b5a69197e5db597ae0de
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, with one prominent heuristic identifying it as a 'PDF_SEO_LINK_FARM'. The primary external URL, https://jottigo.ru/strik?utm_term=what+is+a+religious+science+practitioner, suggests a phishing or content-luring tactic. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

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://jottigo.ru/strik?utm_term=what+is+a+religious+science+practitioner PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4369786/normal_5fdfa701e7b99.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389370/normal_60005b0ff03cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465007/normal_600cee7176f71.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469349/normal_601e8b5deaba6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5fe48a0e21700.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/8742cc5dad4797.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453729/normal_600e23c81ccbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_602c3b80c7960.pdfIn PDF document text
    • https://menedufigejit.weebly.com/uploads/1/3/1/4/131482930/zufevatoputusedo.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/fejififimaketo/90055768393.pdfIn PDF document text
    • https://s3.amazonaws.com/zufojadibi/zadeja.pdfIn PDF document text
    • https://s3.amazonaws.com/wegugus/folic_acid_foods.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/10641772925.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/35832966004.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/4889287105.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/informant_interview_define.pdfIn PDF document text
    • https://s3.amazonaws.com/bededuxotulapil/90993772772.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 5208 bytes
SHA-256: 63cef00030e33278b4f4f61c497c190730e875fd406c745c0b012cd53c4cf2ca
font_01_sfnt_off0000fefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFD 12448 bytes
SHA-256: 8a201c2ba12dc3a999d353304becb9ba3d13fe977cc79ae398bd7656ea210316

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