Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6bcb7eaefc6139…

MALICIOUS

PDF

79.9 KB Created: 2021-03-20 12:50:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 840539ca9629e726bc84238fbfb0aa74 SHA-1: e6cfd57e09bb6181ba89a359b3a27596dbddb292 SHA-256: 1d6bcb7eaefc6139a0191cb9a6b4657592894728af3b685f717cd048cd5b3d03
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, with one specifically pointing to a suspicious domain associated with a keyword search. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of multiple external links strongly implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pelibifir.ru/wix?keyword=where+to+buy+alpha+labs+garcinia PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4408713/normal_6055b7c96931b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482413/normal_6051e795c5565.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411270/normal_600820cde5583.pdfIn PDF document text
    • https://luwimejimidilen.weebly.com/uploads/1/3/4/0/134040945/1037633.pdfIn PDF document text
    • https://cdn.sqhk.co/kekotenonaxu/hJHfEjc/puzzle_bobble_4_descargar_para_pc.pdfIn PDF document text
    • https://fenipedixov.weebly.com/uploads/1/3/5/3/135385823/6d835735.pdfIn PDF document text
    • https://cdn.sqhk.co/worijekegir/eUhiaqX/53791496614.pdfIn PDF document text
    • https://bisebisa.weebly.com/uploads/1/3/1/4/131406118/xusepifonasatewem.pdfIn PDF document text
    • https://pejeronasoko.weebly.com/uploads/1/3/2/6/132682646/9827883.pdfIn PDF document text
    • https://tozugijojabam.weebly.com/uploads/1/3/4/6/134640227/gidoxisejugozusuluze.pdfIn PDF document text
    • https://punuvenow.weebly.com/uploads/1/3/4/4/134445800/movikiwatux.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_7c57bcceca994f609813aa0482c38d9c.pdf?index=trueIn PDF document text
    • https://b03e51a8-7171-48c0-94d6-e4c032e6f37f.filesusr.com/ugd/9421c8_76560d6db669427fa6ddcb9aebd5597c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/baf2b76a-85c7-4748-8a9f-0904b62a5bea/breville_toaster_oven_pro_sale.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_59089191ca22497fb063f14b32104bc8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/543a93bf-0ae1-48cc-8ef5-21edbc4012a8/tatoribinutasaxo.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_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 5452 bytes
SHA-256: 6650dedc349a542b9c17a04b77630eb5953e44c33d629e034b93ba2df32031a6
font_01_sfnt_off00010f3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F3D 10460 bytes
SHA-256: 5c51542e7ae2bcc3e2f8eccdd7713929e587553593a06388b1b6fbbac86c8bd4

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