Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca4ed9f09497a17…

MALICIOUS

PDF

82.5 KB Created: 2021-05-26 07:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 6bc64f8c0363a9afffe5c8576c1655e7 SHA-1: 522f9b619520861d69686279cff65a731013b9be SHA-256: 8ca4ed9f09497a1791ff4fc2d6dc5d5f67e33cea1747c23a988f98e4bc27f080
96 Risk Score

Malware Insights

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

The PDF contains an embedded URL that leads to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains text related to the URL's query parameter, suggesting a phishing lure. No scripts were extracted, but the presence of an external URI and the ML classifier's high confidence indicate a malicious intent to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=what+is+the+antonym+for+lonely PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4377371/normal_603599c175f6d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500669/normal_5fe052c9d7d84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390366/normal_606e60ff44b56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487184/normal_6056383b1f572.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459777/normal_6002aa8d24d66.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424025/normal_5fd0641634a39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496151/normal_603694e5cb025.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419206/normal_601d555828313.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403533/normal_6022a566db67d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373778/normal_6057a929283d3.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/gowebabuxogiro/present_continuous_exercises_with_answers_for_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae2b3c21-9027-4934-923a-6423186b8c1c/the_tongue_does_all_of_the_following_except.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c063d4b-99bc-408c-ac0d-7515cf513cc8/65814495084.pdfIn PDF document text
    • https://s3.amazonaws.com/topipovikapari/hungarian_dance_no_4_viola_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/376a7d1f-0484-49a2-bd93-fac910e09493/gofotiwelepezafituwuf.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/wimimukoburi.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/online_casino_games_no_registration_no.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/6537093284.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/45574763470.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/review_of_clinical_anesthesia.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/raiders_bears_injury_report.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_off000104af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104AF 5124 bytes
SHA-256: 81d2b4b1e94b12ecd55b3fc1c283735daba2cd8da90516b9ba4887de507ffade
font_01_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 11308 bytes
SHA-256: 04435f4f10fcfa497ca9cc2c89902246242c66535dc15e2980078fb853a29ef9

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