Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5f17f16a82258c…

MALICIOUS

PDF

85.9 KB Created: 2021-03-20 11:31:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6e1a1069757d6af1f5c7d2ff7656dd9d SHA-1: 7267a9b1eb4ace90d58de710611f9b1b645e52ad SHA-256: 7f5f17f16a82258cd14d6237e64d8e27d57d5988ea2790a6ae556c5f1d73abd4
192 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'Game of life cards printable'. The presence of numerous links on disposable hosting and the ML classifier's high confidence score indicate a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=game+of+life+cards+printable In PDF document text
    • http://freefire-gifts.com/jazamogejarukesu6wak4.pdfIn PDF document text
    • https://cdn.sqhk.co/nozesinipi/icmjcAI/3536290061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483337/normal_5ff55a8b386fc.pdfIn PDF document text
    • http://lnstagram-office.com/alta_via_1_guide_bookzpsyc.pdfIn PDF document text
    • https://cdn.sqhk.co/gujowaxexag/jihsYjb/under_the_influence_meaning_in_punjabi.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/glSbJfB/fukapifivefez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_604f9797adaf3.pdfIn PDF document text
    • http://epipog.com/89557674349rvate.pdfIn PDF document text
    • http://saroforati.medianewsonline.com/zatinidixawexutaz.pdfIn PDF document text
    • http://myfavoritesun.xyz/41593655054l0b7a.pdfIn PDF document text
    • https://cdn.sqhk.co/bomaguvodar/ohjyggh/vunazujepoxolijopevukugi.pdfIn PDF document text
    • http://fruitslope.online/gracie_barra_fundamentals_curriculum_dvdna29z.pdfIn PDF document text
    • http://gebikomuxe.getenjoyment.net/73905778720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_0b8c9d4a19e54c0bba467e87f4cf1198.pdf?index=trueIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_1c8c478abf0549dd9e567cfb907a6892.pdf?index=trueIn PDF document text
    • https://025b4bf0-2906-4f5f-8a0f-6d4b68fc9518.filesusr.com/ugd/148ee2_aa13a0c423fe4de298dabb1c308d2e53.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF959 5472 bytes
SHA-256: b08be0ce81aab492b00f722b69d152756039d443e45b44b114219969b9effd16
font_01_sfnt_off00010bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDB 11844 bytes
SHA-256: 45aa505b7d83a82f898c1a84a005c714635faf48bbce0ccae7d1db008adf7ff6
font_02_sfnt_off0001346d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 16460 bytes
SHA-256: 35911eaee13e0b545d1dfcb739d59a9de620d4422c97101e0d774d7200b1dc5f

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