Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d78c0f307c7c7a1…

MALICIOUS

PDF

70.1 KB Created: 2020-11-14 21:40:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ebb95233e40361ff283d6b133cfe88a6 SHA-1: 9b7cc21cfeffa91e5bccc6e83aeaeb69e956581c SHA-256: 4d78c0f307c7c7a1540f891986faa8f875648dcd347b2671262bdc0fee1c7f77
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffmen.ru/123?utm_term=kjv+bible+apk+audio In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370265/normal_5f8a3eee3b37d.pdfIn PDF document text
    • https://diboboxu.weebly.com/uploads/1/3/4/3/134330346/jevato-ramiratotixo-fomedobulakegut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369302/normal_5f897899a844b.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/1289421.pdfIn PDF document text
    • https://rimosuvifakub.weebly.com/uploads/1/3/4/3/134310068/eab75766f69e81c.pdfIn PDF document text
    • https://daxusakisawepan.weebly.com/uploads/1/3/4/5/134527958/tuvipetajasosa_zufakediket_godubod.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/7110618.pdfIn PDF document text
    • https://jupoviladuxeru.weebly.com/uploads/1/3/4/3/134310568/suzolutupun.pdfIn PDF document text
    • https://liwevapazu.weebly.com/uploads/1/3/1/0/131071299/figasivumo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409395/normal_5f9e4cce182a4.pdfIn PDF document text
    • https://todijaxazifaro.weebly.com/uploads/1/3/4/3/134342800/gulad.pdfIn PDF document text
    • https://lokapane.weebly.com/uploads/1/3/4/4/134464640/wujasokakuxevo-fudeki-medasufipe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC230 4988 bytes
SHA-256: 8be05f2d3d6da4f47fabbf1ed9946332157c7bfbce6bd315cd22c41df3aa93b4
font_01_sfnt_off0000d337.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD337 5556 bytes
SHA-256: 8b4fb1e4902a94383a6b45e61f28fc931534f233842a831df5766dd26371b8cf
font_02_sfnt_off0000e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE779 10744 bytes
SHA-256: ba6d7c280823913b80cc9c982f830116737536aadb919050479c6f44df989c13

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