Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b4cd183da9e1a5…

MALICIOUS

PDF

79.7 KB Created: 2021-03-19 11:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 039e35e493d9f3d1c072078eed28f748 SHA-1: 5ea223874e088e1130dd6d2823477f5b732ec14f SHA-256: b1b4cd183da9e1a579bc7ed99a9cd54daa1769bfd9f6eeb38b7ea14d0ba09d00
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 0.9996

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://pelibifir.ru/wix?keyword=ford+commercial+song+what%2527s+wrong+with+me PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4486969/normal_603064406510b.pdfIn PDF document text
    • https://cdn.sqhk.co/rasetiwulipu/bu9QULA/horizon_7._8_treadmill_reviews.pdfIn PDF document text
    • https://cdn.sqhk.co/mojupesonon/agcWi9c/45597226629.pdfIn PDF document text
    • http://xovitixekewelom.scienceontheweb.net/90101926239.pdfIn PDF document text
    • https://cdn.sqhk.co/tuseliwi/RHZljdF/vedezibo.pdfIn PDF document text
    • http://kavakedego.scienceontheweb.net/xuzagez.pdfIn PDF document text
    • https://cdn.sqhk.co/mogowepuw/jagf8ja/pimon.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/hjVKOge/duzusuvab.pdfIn PDF document text
    • https://cdn.sqhk.co/forokuxodel/dBgghdx/bowling_techniques_for_beginners_cricket.pdfIn PDF document text
    • https://cdn.sqhk.co/tewisifupib/igjcM3S/21184892086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487647/normal_6048605edf55b.pdfIn PDF document text
    • https://cdn.sqhk.co/zibumimuw/ehg2ij0/sample_of_formal_email_letter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_602353d27eb84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474977/normal_603e5426105ef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5fc6f09f650ce.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_f165ff9b80314e14a655e1a262ffe791.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f609dee8-9082-4397-a6a1-1c51b7c70b15/19781209525.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4850022-5bfe-4a15-916e-db7c1cc56b8b/samsung_hw-hm45c_check_subwoofer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85d08a74-61c4-41d8-90a3-dc2ecc5cc9ee/80264516009.pdfIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_4ac4f738291240f3bdb64a0f805b09c8.pdf?index=trueIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_b1ee97c3edef4c28b1bd306d5a019dc1.pdf?index=trueIn PDF document text
    • http://jabodegodonirad.atwebpages.com/linajepiwimixin.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_off0000f7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 5432 bytes
SHA-256: 11f9f3b4f99cf37c7d3d76c1b73cd50df0b2281de2b3911dd87a0edccaf266aa
font_01_sfnt_off00010a55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A55 11464 bytes
SHA-256: 887a139782d3bd49c90bb786ae16f8b37413750d0a1a5ee8fc540000f641eeb9

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