Malicious PDF — malware analysis report

Static analysis result for SHA-256 425d17e0b92f3ea8…

MALICIOUS

PDF

78.8 KB Created: 2021-02-15 08:41:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6940dc59185c0feb381f7296c0762301 SHA-1: af0267fbe75b3cffcf452812c985342351bd4189 SHA-256: 425d17e0b92f3ea8cb8d70e6894a65c3a99ec43dd884d73de7a6284902a9a55c
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and heuristics indicate a phishing or malware distribution attempt, likely using a lure document to trick users into visiting a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=grade+7+term+1+maths+test+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4486053/normal_601ebe4e0ba27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_5fd2e9fdd45a6.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikureta/difiige/heart_emoji_iphone_location.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501201/normal_601bb2e53e33a.pdfIn PDF document text
    • http://interbank.link/exponential_function_practice_problems_with_answerssk6na.pdfIn PDF document text
    • http://exemplpusj.com/brevet_maths_2019_pondichery5fff4.pdfIn PDF document text
    • http://netzamka.ru/37153081977dpno3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462038/normal_5ff636d0b269c.pdfIn PDF document text
    • http://info-pages.ru/90127140609pxj0a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464870/normal_5fee95477719f.pdfIn PDF document text
    • http://misstourist.info/mirobeod0li.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/waxapoz/gikerazedujewizegusikop.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/77149092318.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/sukerawubazudaxonupa.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD443 4936 bytes
SHA-256: aff9faaed14e3c021673903121ea4f2afa03263a577a088151ef7fdf974accd4
font_01_sfnt_off0000e51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE51C 10920 bytes
SHA-256: 1233c5f2e1c8e32afa46ad6320523634e712b11562f97424106c3c2ce88e927c
font_02_sfnt_off00010a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A82 16088 bytes
SHA-256: 1264a556fabc14c69ec4ba4609a347bffa09942e523f09f2774283a283413be9
font_03_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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