Malicious PDF — malware analysis report

Static analysis result for SHA-256 b92c4e93d0f0a62b…

MALICIOUS

PDF

74.4 KB Created: 2021-05-29 14:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a6e0a3441070fc60b05765f7616e57af SHA-1: 5b67a605ddc5d1b22b03b2b158fb1ddd96606d29 SHA-256: b92c4e93d0f0a62bf37f0b3bbd0f9c06aa0b30ecc1bae61fc1ef0d6f48df9aa8
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://mezovuduw.ru/strik?utm_term=how+do+i+install+pluto+tv+on+my+lg+smart+tv PDF link annotation
    • https://wuwebiwurumebil.weebly.com/uploads/1/3/1/1/131164488/1983503.pdfIn PDF document text
    • https://zejenabo.weebly.com/uploads/1/3/0/9/130969472/5901221.pdfIn PDF document text
    • https://tapebosipufadiz.weebly.com/uploads/1/3/4/3/134366988/4e19ae.pdfIn PDF document text
    • https://josudirojupa.weebly.com/uploads/1/3/4/7/134729494/0b0a12b.pdfIn PDF document text
    • https://razixolinatu.weebly.com/uploads/1/3/4/3/134384461/fufovoweluwuje-xiwipitata.pdfIn PDF document text
    • https://manonerotorupu.weebly.com/uploads/1/3/4/6/134683358/3147033.pdfIn PDF document text
    • https://wasefopepaseb.weebly.com/uploads/1/3/1/8/131856398/21949140670ccda.pdfIn PDF document text
    • https://wuxigato.weebly.com/uploads/1/3/2/6/132680835/d4e6c9985bde288.pdfIn PDF document text
    • https://nidimikijugura.weebly.com/uploads/1/3/4/7/134710695/sajek.pdfIn PDF document text
    • https://dekoreriso.weebly.com/uploads/1/3/7/5/137501726/5149918.pdfIn PDF document text
    • https://bedakowunuva.weebly.com/uploads/1/3/4/3/134342711/091f8e8b74f.pdfIn PDF document text
    • https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/4343897.pdfIn PDF document text
    • https://vusuneroroloxik.weebly.com/uploads/1/3/4/0/134096702/5b2b4b0f7bae2b2.pdfIn PDF document text
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/nutepami.pdfIn PDF document text
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/425a0871becd49.pdfIn PDF document text
    • https://detidigem.weebly.com/uploads/1/3/4/4/134491675/2345882.pdfIn PDF document text
    • https://numudapusolu.weebly.com/uploads/1/3/4/6/134628478/0e6cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c9c6558-1e74-45f0-bfb0-7cf221e8f205/ravidokoguxabomatiwam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1abfc54-7ef4-4332-87d2-aa54c4b38344/gorewut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/545ebda2-88bc-41b4-a290-a503fc8d4406/how_to_find_the_ima_of_a_wheel_and_axle.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_off0000e3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 5492 bytes
SHA-256: 7cbb9a82ca26b960813ae12a4386c0c812d8fe9e22d5e6213f0be25c17829fe5
font_01_sfnt_off0000f6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A7 11004 bytes
SHA-256: b2103562c4427987661fbd42ecac0f5d1db7f6f774b0d0eec3e574795be66445

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