Malicious PDF — malware analysis report

Static analysis result for SHA-256 2969378283d1f3d4…

MALICIOUS

PDF

74.7 KB Created: 2021-02-24 06:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: ab4a1abd5b5a841d06b71e9efb761596 SHA-1: c53a43cb6cb17bc9c55c5973ec6f77b04abcc199 SHA-256: 2969378283d1f3d47c7cdb004dd78cbe65ca4c15c719f0473fb68b009bac9e5e
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, specifically 'https://crophysi.ru/123?utm_term=guess+how+much+i+love+you+book+by+sam+mcbratney'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, appears to reference a book title, suggesting a social engineering lure.

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://crophysi.ru/123?utm_term=guess+how+much+i+love+you+book+by+sam+mcbratney In PDF document text
    • https://cdn-cms.f-static.net/uploads/4457302/normal_600e078c1f0bb.pdfIn PDF document text
    • https://cdn.sqhk.co/fekebazi/iMhdgfn/free_online_spelling_games_for_5th_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/seworani/jeVjhjb/7672391017.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368481/normal_5fc9503eaf6e0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5ff451dd61e18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414352/normal_5fefcab55858c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451545/normal_602e43ecc2751.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489263/normal_5fe2c4cebed1b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415739/normal_5feb863f2730b.pdfIn PDF document text
    • http://milawigigobo.iblogger.org/sears_catalog_homes_for_sale.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kozolamo.rf.gd/liver_cirrhosis_guidelines_for_management.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/wivinijifas.pdfIn PDF document text
    • http://duxidomotafuzag.rf.gd/nagakefosebafusogamigeli.pdfIn PDF document text
    • https://s3.amazonaws.com/xefejevife/690931634.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/dovakogidinunumumafi.pdfIn PDF document text
    • http://menutewewunidov.rf.gd/vejujosukewukuru.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/canadian_food_guide_2019_cbc.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/erik_erikson_biography.pdfIn PDF document text
    • http://deniketeza.rf.gd/83821107232.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/29993766862.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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 5528 bytes
SHA-256: 3cc310b95f1f01fe75208e6f043d6a50aa3c83cac1e5ed1d1f4adf71755233cf
font_01_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 10900 bytes
SHA-256: 02b49140d7f63dedf8d682dbf9e47db06138d9ca8ba4fa96936cc6e7e716a33d

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