Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab08c1b9e9a4a4d8…

MALICIOUS

PDF

75.1 KB Created: 2021-02-05 18:42:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a0d015d3d634843e0c0aa0bbc1254f89 SHA-1: a79833e70aee77315cdb69ab650a4cd6dff7b9c8 SHA-256: ab08c1b9e9a4a4d8459d55b4276897dcf5c2d5ca0789a875c1a734fc3a850140
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links, with a critical heuristic identifying it as a malicious redirector and a link farm. The primary malicious URL, 'https://crophysi.ru/wb?keyword=across%20the%20stars%20sheet%20music%20cello', is likely used to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

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/wb?keyword=across%20the%20stars%20sheet%20music%20cello In PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fe6a5ffb979e.pdfIn PDF document text
    • https://bisubobotikimix.weebly.com/uploads/1/3/1/4/131438323/giwaruleraxizeperu.pdfIn PDF document text
    • http://wutulesarox.iblogger.org/digital_marketing_textbook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483836/normal_5fee4040b9603.pdfIn PDF document text
    • https://suletakawuzumab.weebly.com/uploads/1/3/5/3/135348492/822968.pdfIn PDF document text
    • https://womovenurobo.weebly.com/uploads/1/3/1/8/131872055/powopogegakufaw.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/safenalavojuwu/82120366750.pdfIn PDF document text
    • http://ribibepope.epizy.com/commercial_rental_agreement_ontario_template.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/latex_beamer_insert_image.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/mystatlab_final_exam_answers.pdfIn PDF document text
    • http://bozizivaposenu.epizy.com/android_auto_toyota_highlander_2019.pdfIn PDF document text
    • http://pepabalexesoge.rf.gd/journalist_reporter_resume.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/mobile_antivirus_app_apk.pdfIn PDF document text
    • http://todosix.epizy.com/funny_answers_to_what_you_up_to.pdfIn PDF document text
    • http://fuzadakeju.epizy.com/firefox_android_import_bookmarks_from_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/jazzy_jingle_bells_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/asking_for_information_email_subject.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/atrial_fibrillation_guideline_2018.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_off0000e927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE927 5028 bytes
SHA-256: e98c4c9ccce13f91258edadab1cca314ff585d74ae4fb55912026d50f5a9683e
font_01_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 10856 bytes
SHA-256: 95b75aed3a775cf161baa98a11a73fbabf12c9fc029bad39ea0e72b38f58a452

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