Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fc6db3242fdfbd…

MALICIOUS

PDF

74.2 KB Created: 2021-02-18 21:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 061a1dc786ffedd9448847b5bd433862 SHA-1: fb3902250f21fb54af64c01ccd72bd830d4aee2e SHA-256: 98fc6db3242fdfbda2d6e02561a911242e4096709657caff3295d1a0a98513db
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a link to a known malicious redirector, indicating a phishing attempt. The embedded content, though heavily obfuscated, suggests the document is designed to trick users into visiting the malicious URL under the guise of a software installation guide. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9428

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
  • 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.
  • 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/strik?utm_term=oracle+12c+instant+client+installation+guide In PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_5fd09ec3bdd85.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/ihcBZQ1/gunshot_range_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/2Pjibgc/monelilafukewofu.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/Lhiigjd/tonidoj.pdfIn PDF document text
    • https://cdn.sqhk.co/veleviziwew/38gcgdY/ates_ve_su_5_sabah_oyun.pdfIn PDF document text
    • https://cdn.sqhk.co/xafukapewe/jhNyWJI/application_wish_pour_windows.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451737/normal_5ffe9c9e60b06.pdfIn PDF document text
    • https://cdn.sqhk.co/zebimapajod/eRap7af/mazabar.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/M0d7gdU/jigobukerinaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463308/normal_6023f4c4105ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5fd5f618282ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371814/normal_601432bcd70c7.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/mqejbLx/hair_salons_open_on_sunday_in_raleigh_nc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/woberiz/74922247764.pdfIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/13497969972.pdfIn PDF document text
    • https://s3.amazonaws.com/rilexazejuzovep/cystic_lung_disease_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/fadobirak/intra_abdominal_infection_guidelines_ppt.pdfIn PDF document text
    • https://s3.amazonaws.com/fogibi/royal_navy_bleep_test.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/waxarebotodugorubix.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF41 5200 bytes
SHA-256: 8224de2b9217fb7ef32f7e62a18961363522e7af56f0800b015fa580e53c010a
font_01_sfnt_off0000f0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FE 10796 bytes
SHA-256: 72f1a6b116e97682531ea014b8dd52d87ef0436b80d066fb9fece1bfa004785d
font_02_sfnt_off000115bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BF 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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