Malicious PDF — malware analysis report

Static analysis result for SHA-256 b88f238a08409a39…

MALICIOUS

PDF

72.0 KB Created: 2021-02-12 13:43:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 47e7799e085dd5cab5e52b8b1055206d SHA-1: 1f461b31f0a8aeb4baa4e316e21b8f1aadee66f0 SHA-256: b88f238a08409a393e8fc7e25582adb6f1594b1159b2d0ea6da2c87e42e6c6a4
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://yafferge.ru/123?utm_term=filth+book+pdf'. This URL is the primary indicator of malicious intent, likely serving as a lure for phishing or malware distribution. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a malicious URL within the PDF structure is sufficient evidence for a phishing attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/123?utm_term=filth+book+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4385437/normal_5fcb71b42c78d.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/ahg1gfp/jeginowexo.pdfIn PDF document text
    • https://cdn.sqhk.co/kinirebuseva/Usnjx0M/36350336826.pdfIn PDF document text
    • https://cdn.sqhk.co/posukomokufi/jaif7jb/33311910010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450502/normal_600f3eadc380c.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/hfhaPJN/texas_state_railroad_rv_park_campground.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_600aa04d8c20a.pdfIn PDF document text
    • http://datinge.site/kubuporupusuvomuvirekewim0fp94.pdfIn PDF document text
    • https://cdn.sqhk.co/rivogigaweb/kghIgcV/tubexuvakewij.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/peveziwoguxuzam/sm_squeeze_indicator.pdfIn PDF document text
    • https://s3.amazonaws.com/punurum/brain_teaser_worksheets_for_highschool_students.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/74148119626.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/android_admob_banner_ads.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/related_work_in_project_report_example.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/bhojpuri_gana_video_hd_ing_ke_sath.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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 4804 bytes
SHA-256: 2bccd9f62a0795e5e67629d17757a9be61255207b10714c79478a7d41adde0d5
font_01_sfnt_off0000eebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBC 10644 bytes
SHA-256: 65136ec5d642538eee3795770a3b6bb4578cb3f0bd5bf1d7c7922bd7b95ffd60

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