Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d41cd5551779150…

MALICIOUS

PDF

78.0 KB Created: 2021-05-24 11:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 16dd00dd99ec151373ae8b4a4cf347e8 SHA-1: b8df6177f7d5fe18fc963ca7d032227a55d709ae SHA-256: 9d41cd5551779150ec52c4afac6ea8bf6a64b872416df038ba8cc8642381c937
144 Risk Score

Malware Insights

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

The sample is a PDF document that uses brand impersonation (Apple) to trick users into clicking a malicious link. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URL, https://botokaw.ru/strik?utm_term=how+to+print+screen+in+acer+laptop+windows+10, is identified as the primary lure for credential phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://botokaw.ru/strik?utm_term=how+to+print+screen+in+acer+laptop+windows+10.
  • 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
  • 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://botokaw.ru/strik?utm_term=how+to+print+screen+in+acer+laptop+windows+10 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5fe01d541e1fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_601fe3e30056f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_605f69b9a2cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416664/normal_60550a9cbfd27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462992/normal_5ffcc5c8bbf21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410431/normal_5ffcd58683589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453553/normal_60155d0710f97.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_602d5575ad28a.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/lebejos/74381101561.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/paxiwedugaripaseno.pdfIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/pemubawupijumem.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/cd_burner_free_italiano_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/baposivarabuj/aparichitudu_telugu_movie_hd_full.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/67393645499.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/zokadadasam.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/32339603737.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/suspicious_activity_reporting_training_video.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/the_blue_book_is_used_by_disability_determination_services.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/ludilufitoni.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/gizifimefekirupinuvavizu.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/69809799872.pdfIn PDF document text
    • https://s3.amazonaws.com/xokebore/configura_aruba_mail_su_android.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_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 5316 bytes
SHA-256: c10e8c0a7405bbda877a2fc76efe6b992ecca88b613e4dbe93185dd5d855ad3c
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 10400 bytes
SHA-256: b3a3fdffcdff4ebc348d21b7089be9a8037dbd18fd0206f9cd1bb9a062293637