Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a3b73004fdd1cb…

MALICIOUS

PDF

73.0 KB Created: 2021-03-04 05:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 668614fac51d6794d896f13b9ce09b31 SHA-1: a8051d92f7408097d8926c8d49680d310c6582bb SHA-256: 92a3b73004fdd1cbc591166608ea6c8af11cc69ce483c557670f39cc38e7a4d6
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The PDF contains numerous embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The presence of a 'SE_DOWNLOAD_BUTTON' and 'SE_CALLBACK_LURE' further supports a social engineering attack pattern designed to trick the user into interacting with malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/wix?keyword=hotschedules+app+apk In PDF document text
    • http://nizavevorupuj.mywebcommunity.org/kawitibiru.pdfIn PDF document text
    • http://qwonder.space/captain_tsubasa_dream_team_japanese_version_apkc0rcu.pdfIn PDF document text
    • http://olivamebel.com/phrasal_verbs_lista_z_przykadamih39cw.pdfIn PDF document text
    • http://wekeb.space/kawebusetelaludhpj2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403556/normal_5fdfc12e8e533.pdfIn PDF document text
    • http://lordtrans.ru/wakatoledijixitelzpr2h.pdfIn PDF document text
    • http://ledy66.net/zunelujuvejasader4e2tz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368468/normal_603defbcedba0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5ff51f35282f7.pdfIn PDF document text
    • http://rmk4sale.xyz/pellegrino_artusi_librodnb8g.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473035/normal_5ff64ddccdfd2.pdfIn PDF document text
    • http://6gusevshop.space/retinografia_glaucomaywil9.pdfIn PDF document text
    • http://sobakin.space/wozavuxedejurazzyyxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://redifigikutusoj.myartsonline.com/7734334098.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/momalogu.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/us_history_book_11th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zidosozawok/118567925.pdfIn PDF document text
    • https://s3.amazonaws.com/polojuliragam/goo_goo_dolls_iris_piano_sheet_music.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/harry_potter_and_the_goblet_of_fire_book_chapter_6.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/pudolol.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_off0000e0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CC 5092 bytes
SHA-256: 722003be3424dad71f6b5d7ab0c8f5b1e7578ab054f25765d22ba8d5a2b03764
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 10928 bytes
SHA-256: 7df0754a2a094ab0c8b243f80464b13a085ad11d3cb09c9659ed90088f9d0dae

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