Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7a4e78f6d8fcc9…

MALICIOUS

PDF

74.7 KB Created: 2021-05-22 14:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 358be83d039132eb2b9d21b6041e5e75 SHA-1: 0a4420ce337c23bae9ff6e83049c22b47f533073 SHA-256: 4b7a4e78f6d8fcc9d43f041822ce777d2e2dbbb4730fd214c499df95df3353cf
164 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL pointing to a site offering software cracks. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and a link farm suggests an attempt to redirect users to malicious content or to improve search engine ranking for malicious sites.

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.
  • 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://jottigo.ru/strik?utm_term=download+cubase+7+crack+%2526+patch+%2528emu%2529+by+team+air PDF link annotation
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/pomufi-firasinif-ludikititara.pdfIn PDF document text
    • https://ponekuxu.weebly.com/uploads/1/3/4/7/134747949/4490649.pdfIn PDF document text
    • https://jamobosis.weebly.com/uploads/1/3/4/6/134684796/d1ecb22e591b1c6.pdfIn PDF document text
    • https://tiluzapibijodok.weebly.com/uploads/1/3/4/2/134265907/52ba5.pdfIn PDF document text
    • https://seniwotod.weebly.com/uploads/1/3/5/3/135346371/18b2f2f4a81.pdfIn PDF document text
    • https://jazazigiw.weebly.com/uploads/1/3/1/3/131398077/fd79743.pdfIn PDF document text
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/49bb4ed259d0.pdfIn PDF document text
    • https://velazidolis.weebly.com/uploads/1/3/0/9/130969689/0f4d23337.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/dibedamoka/gladius_relics_of_war_imperial_guard_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/782cb219-8a6d-463c-b114-265990c1dfca/ge_70_pt_dehumidifier_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/banco_santander_app_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/poresi/verb_tenses_worksheet_3rd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/kijivixuzulig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b986ea4-eed9-4877-91ce-ea3f7f558145/essential_chemistry_for_cambridge_igcse_workbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf37c638-fa60-4907-91b4-3cdf54e8d689/xekojadalugevoba.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/what_is_considered_personal_data_in_gdpr.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/67222759749.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29478179-5f94-42c4-b316-3b3a24f75acc/tikezibiruzejivi.pdfIn PDF document text
    • https://s3.amazonaws.com/jemisajoda/banner_template_word_2007.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_off0000e5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AD 5308 bytes
SHA-256: ce84954dc10f1e8580210e3f0ff873c08863a758c47a8f78c741e0aa77c526f6
font_01_sfnt_off0000f7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E7 11108 bytes
SHA-256: f6d6794911e1ffdce448028fcbea4d6e52c9f9060dcdfb8c8795c3c304a16e30

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