Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd8151d9e9eeb0f…

MALICIOUS

PDF

73.3 KB Created: 2021-06-06 02:48:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e1233fdcfee593d972a2ae465913f77f SHA-1: 41c8857c796f51dc00be0e49b3b3a3d7e9d0c79d SHA-256: efd8151d9e9eeb0f6a274f6aef891f45e13d496bc7486db2e0da9330ad5efd11
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/pbw?utm_term=how+to+reset+panasonic+microwave+demo+mode PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4417309/normal_60b1f89d82782.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_5fe6c4e05dd62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504554/normal_602062b53332f.pdfIn PDF document text
    • https://lirupije.weebly.com/uploads/1/3/1/6/131606624/57f924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481831/normal_60257afb83dc5.pdfIn PDF document text
    • https://pevigegokepos.weebly.com/uploads/1/3/4/3/134366184/daponowir-busezisif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387408/normal_5fc9eba86f818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_601d8fb52084f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381098/normal_60456fb2e652b.pdfIn PDF document text
    • https://lukexurilewudon.weebly.com/uploads/1/3/4/3/134335891/12a1603f.pdfIn PDF document text
    • https://kivexobine.weebly.com/uploads/1/3/4/8/134859900/pozibat.pdfIn PDF document text
    • https://linikakisevokeg.weebly.com/uploads/1/3/6/0/136098208/sojozubusase_rakapu_newutonemevepub_tugozixe.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/3a670040-3adf-4edb-baac-6fd99c1a1b81/vopabatup.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144411933/do_you_have_to_print_your_southwest_boarding_pass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21bdf496-7892-448b-ac14-724c1de6390f/sifamunevulepogabene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d0aad1-9bd8-4e11-881f-7a4cfbe7092f/92043431790.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/f/83428946514.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144426747/20112502917.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_off0000e192.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE192 5300 bytes
SHA-256: fbef5011e43108d276f1bcbb2f62d56f0147159acd1939f8907cf6e1942b05ea
font_01_sfnt_off0000f395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF395 10772 bytes
SHA-256: a1c4cd69c71017c0b5fac45e849298fc92a09690cc693101543ae488f41dd5da

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