Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e12050006d447b…

MALICIOUS

PDF

100.5 KB Created: 2021-05-06 14:01:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 19b60052ffd3e622913363cb95a7b79d SHA-1: b18e50f6322c9e536c8bc64e538944d37fa53053 SHA-256: d5e12050006d447bedb69f384081e5fe0b28eccee9bd8505b45cd5c1d23cef43
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/strik?utm_term=full+logarithm+table+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4464722/normal_606ea8738f1d6.pdfIn PDF document text
    • http://povulofi.mywebcommunity.org/jazojemuminozepe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452626/normal_60435f39849d2.pdfIn PDF document text
    • https://jurivulanikep.weebly.com/uploads/1/3/4/5/134525456/zukepup-kadozud-xuwepufixoru.pdfIn PDF document text
    • http://wutopezogegusi.getenjoyment.net/how_to_make_a_frame_bunk_bed_ladder.pdfIn PDF document text
    • https://tejenopaje.weebly.com/uploads/1/3/1/1/131164027/95030b11b696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_5fd7da05e5544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391602/normal_5fd923028b570.pdfIn PDF document text
    • https://romarifekaxa.weebly.com/uploads/1/3/2/6/132683260/1290454.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0ffdd24b-620b-4f4d-94ef-a39da1ca20bd.filesusr.com/ugd/853ce2_b4bb8277c9dc45c9931f21bdd76f3448.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ecbaee9-64ab-4ba5-94c4-60f31e1385f4/65641136093.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18ed2169-6cce-4da5-a265-34e57add21ed/69931383700.pdfIn PDF document text
    • http://vidilig.onlinewebshop.net/jofulomidobimiwilegif.pdfIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_ffd3f003d27548869fb024b47a18c01f.pdf?index=trueIn PDF document text
    • https://28ed73df-463f-41d7-bc87-4635118fd8e0.filesusr.com/ugd/74acc8_64e7b94345e2414bbe7049d3945abdd8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d67e24b-63ac-4231-9fef-9110155ab943/78513681784.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9d4e657-7fc1-4129-bcac-674b326c4d26/88067236831.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec0c8658-f102-4b36-bdc2-68f5946859c5/the_dark_tower_2017_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5941a976-9572-4686-9181-ba363f49f501/keroperokajokudoviweba.pdfIn PDF document text
    • https://9e1bd277-069e-4713-bdcc-1ab96cf790c3.filesusr.com/ugd/5fd2af_23bf727b1fa7469ebf2b0c54ec744ee0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b708bf-c081-46dd-a0de-4e9bedfc97ea/74874368013.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_off00014787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14787 5372 bytes
SHA-256: 06fe28c4b1c5d4f02bedef0c123a24ff256bc38c0ebeefbc89de5fa757219939
font_01_sfnt_off0001599e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1599E 12144 bytes
SHA-256: 4a6d04b545d1fe7e80eacd3b642a3ad1349f17df55f155199a0b334b4cd7171d

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