Malicious PDF — malware analysis report

Static analysis result for SHA-256 95d9d6ac45feaf52…

MALICIOUS

PDF

72.5 KB Created: 2021-06-09 15:00:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 426f531935f967e023f9fe624d31224c SHA-1: ef58254eaf472c4cf124490902cbf69089f11ecc SHA-256: 95d9d6ac45feaf5240222d836d5efb563e7a1c501fb7c4630ab5d398f07effe9
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 0.9998

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://pistant.ru/pbw?utm_term=batch+file+ascii+art+generator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4425211/normal_603aaa004428d.pdfIn PDF document text
    • https://galexoraka.weebly.com/uploads/1/3/4/5/134524836/jegir.pdfIn PDF document text
    • https://lakupemeza.weebly.com/uploads/1/3/4/2/134235705/legolunet.pdfIn PDF document text
    • https://mevajivikupewog.weebly.com/uploads/1/3/0/7/130775189/8099251.pdfIn PDF document text
    • https://sivaxawisebirim.weebly.com/uploads/1/3/1/4/131407763/4142937.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_60624684a8ad0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415061/normal_605b0c4554aed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gezebal.pbworks.com/w/file/fetch/144737901/50254144761.pdfIn PDF document text
    • http://fokurid.pbworks.com/f/pamomimuwunabifano.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f825eac9-a98f-4634-b483-d972408b90b4/youtube_safety_dance_vintage_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b3e6fc9-050d-4111-9fad-e164aef1fdeb/windows_7_loader_2.2_1_free_download.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/61089768997.pdfIn PDF document text
    • http://zegugas.pbworks.com/f/fudipebosor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4641de41-e1af-4736-ad57-f7bfc0f8f2b6/periodic_table_black_and_white_a4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20faee61-065d-4d27-b070-0c76929259f3/is_astas_grimoire_powerful.pdfIn PDF document text
    • http://wejojixi.pbworks.com/w/file/fetch/144423549/disisinelilugenagen.pdfIn PDF document text
    • http://favixose.pbworks.com/w/file/fetch/144608340/34861076110.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/f/nadetofojomotikotebupagik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e62b55-105e-4e1d-b0b1-089c6bdbdb04/26576571752.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febbb2e4-8286-4af1-99b7-2de55b4ddfe4/gitamoxer.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_off0000dac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 5192 bytes
SHA-256: 7d5d6bfda7099058510965e0624a9c44158d0951a5763aa72f2f5ffdabab0a9b
font_01_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 11824 bytes
SHA-256: d19b8230be5bfa6b785cc5d3b7403a72f92fbd6c5cd0aba3fb2bbb2f98d8dbe0

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