Malicious PDF — malware analysis report

Static analysis result for SHA-256 97990957513b2158…

MALICIOUS

PDF

80.4 KB Created: 2020-11-17 00:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 52930d6efd0ecca1291eb0ded8f9bef9 SHA-1: 05789cff4c0246a81e7c60e5c355635475582c49 SHA-256: 97990957513b2158c75a45a7d42ae1a77eedd8bc9ac48a1f40c3142c186ac89d
226 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The 'Browser extension / update installation lure' heuristic indicates the document's content is designed to trick users into installing potentially harmful software. The ClamAV detection and ML classifier further confirm its malicious nature, likely as a phishing or malware distribution vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://trafffi.ru/123?utm_term=google+wifi+password+hack PDF link annotation
    • https://gonupedifi.weebly.com/uploads/1/3/4/5/134524362/lunadaxefo.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/zesakanas-xefesitux-koxamiwalikojes.pdfIn PDF document text
    • https://xoniwolujejusun.weebly.com/uploads/1/3/4/4/134456196/b66f6767d18e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393763/normal_5f8f46ec1a1fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448986/normal_5f9dafeba0ef1.pdfIn PDF document text
    • https://rekubiregidejel.weebly.com/uploads/1/3/4/4/134464182/7c886.pdfIn PDF document text
    • https://xukolewijox.weebly.com/uploads/1/3/4/3/134320036/7558809.pdfIn PDF document text
    • https://disaxugotusineg.weebly.com/uploads/1/3/1/8/131871710/7a187234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380695/normal_5fb259e544559.pdfIn PDF document text
    • https://xufiwelak.weebly.com/uploads/1/3/1/1/131164558/gotugapitigatoxa.pdfIn PDF document text
    • https://jifurutirijiguj.weebly.com/uploads/1/3/4/5/134528482/nowakotojunage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391024/normal_5fb2fedc2dc65.pdfIn PDF document text
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/nazobupe.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/df290e29-193a-402d-a94a-e485b5658400/figurative_language_in_song_lyrics_w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c32ab1c1-81ac-41d0-b0f7-0a365e1f0205/sejuwawisimix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8341cbe-c293-4cd6-98a1-4e4880a752f5/sabivinunudorijuxoj.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_off0000f901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF901 5604 bytes
SHA-256: 99af7a2a54a2edeb2baeb0cc9285e9a8b09bb49fbef4e7513da8dea4fb97dfff
font_01_sfnt_off00010c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C25 12360 bytes
SHA-256: ec1a59fc63382ae8c668b9e454b75707c3884a3a5b55a91f1f10a00695d131ce

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