Malicious PDF — malware analysis report

Static analysis result for SHA-256 0eaf9bab4f8aec40…

MALICIOUS

PDF

72.3 KB Created: 2021-06-08 20:15:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: e86831dfa23adef4352f8f74a96dba38 SHA-1: 33510b7d14f245e9ba7018d323652cf566a7b45e SHA-256: 0eaf9bab4f8aec4028f5d7d8f1a8760a605c4d81acf5d3f53a8d5de260c74beb
186 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 functions as a link farm, directing users to numerous external URLs, including one that appears to be a calculator lure. The presence of embedded URLs and the PDF structure suggest it's designed to redirect users to potentially harmful sites, possibly for phishing or SEO spam.

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
  • 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.
  • 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://drafthe.ru/pbw?utm_term=compounded+continuously+calculator+with+steps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382413/normal_601c7952b516b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445532/normal_6004b363ccfa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369190/normal_60221efaa09eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450509/normal_602a75e267cf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_6035c23e2a966.pdfIn PDF document text
    • https://tokatukunopiso.weebly.com/uploads/1/3/4/3/134352811/a64c621bdd4324.pdfIn PDF document text
    • https://miwejezapelo.weebly.com/uploads/1/3/4/3/134342363/a4e3224ef12b2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_6057a4b87ec29.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485927/normal_603c34d04ea56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_606cc27059d30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_601a62dc448b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420431/normal_6061789306549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455669/normal_6041d0963c739.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/a57ad871-7493-4038-a7dd-687b2b246a47/53661364393.pdfIn PDF document text
    • http://demopefo.pbworks.com/f/50258513212.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e6410cd-07a3-44cd-be61-d6acf333fd0e/dexedazakugawubilux.pdfIn PDF document text
    • http://palixazoke.pbworks.com/w/file/fetch/144427329/libaxejesozozizubu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4f0f002-8b62-47af-ab2c-1fcd2587cd4b/learn_to_speak_english_fluently_in_10_days.pdfIn PDF document text
    • http://pezaloribed.pbworks.com/w/file/fetch/144504156/collins_scrabble_dictionary_download.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_off0000db29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB29 5412 bytes
SHA-256: b186d4e464a73e7a0f1e43528a5120973dfa20b8b96df56348f9fb67b0bfc23f
font_01_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 11156 bytes
SHA-256: 49807ecdde3a0f7dd86845369e29011fa76c6b834be5809495b726ad64ca5293

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