Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe23ca09aa26a59f…

MALICIOUS

PDF

83.8 KB Created: 2021-06-12 23:30:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 54e55208379686f6539e4c0c99d1fe99 SHA-1: ae08f048923d161ed09cdf3fa813fb02b0574eb9 SHA-256: fe23ca09aa26a59fa95eed0ebeed73268b3eee219e2bd6b1e901f0fea9664bf9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, many of which point to disposable hosting and utilize UTM parameters, suggesting a phishing or SEO manipulation tactic. The embedded URLs are likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nomylo.ru/pbw?utm_term=raspberry+pi+4+ssd+ubuntu PDF link annotation
    • https://lepeposozul.weebly.com/uploads/1/3/5/3/135317560/d837160.pdfIn PDF document text
    • https://wivufazufurad.weebly.com/uploads/1/3/7/5/137505375/3710633.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420589/normal_606c1e8e81905.pdfIn PDF document text
    • https://jutovadisew.weebly.com/uploads/1/3/4/7/134720627/xaruzomisinu.pdfIn PDF document text
    • https://nudaduxovusupin.weebly.com/uploads/1/3/4/3/134337963/8e9fb3e5fcc5c.pdfIn PDF document text
    • https://rerofijujujedo.weebly.com/uploads/1/3/1/8/131872137/8576978.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4494431/normal_60b263c6a5a01.pdfIn PDF document text
    • https://keninowe.weebly.com/uploads/1/3/4/6/134617270/9450572.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/jidemawola.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386092/normal_5fceaf4832419.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494661/normal_5fdb6a43b6605.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366389/normal_5fdf6573cfa2a.pdfIn PDF document text
    • https://bevarepovorumi.weebly.com/uploads/1/3/2/3/132303359/780ca0dd9ff90fd.pdfIn PDF document text
    • https://rusapaja.weebly.com/uploads/1/3/4/6/134617617/1a28b.pdfIn PDF document text
    • https://nazorilorapumug.weebly.com/uploads/1/3/0/7/130776423/komotakari.pdfIn PDF document text
    • https://nizufijaduwetep.weebly.com/uploads/1/3/5/3/135309937/8d4473b7a47355e.pdfIn PDF document text
    • https://fixaporaxaju.weebly.com/uploads/1/3/1/4/131413905/bivenaxifu-pajeb.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/7419560.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/c12fe7b0-fa6f-413b-bdab-d918efd972db/microbiologia_y_parasitologia_humana_romero_cabello_2da_edicion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d3f5297-4a50-4bc6-b5b0-a5f52900074b/58788938300.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/f/34944059170.pdfIn PDF document text
    • http://doxawadar.pbworks.com/w/file/fetch/144614559/19090427564.pdfIn PDF document text
    • http://kedetuwi.pbworks.com/f/39263236131.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3123bdf2-2af5-4752-a7e8-25ed31200890/fantastic_vent_3350_bedienungsanleitung.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 3044 bytes
SHA-256: 0a4b5c31f4257e5a2707017370dcf829c84058060820f6748bf1d2aeb2c81f0e
font_01_sfnt_off000108ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 5260 bytes
SHA-256: b33c1627cdf0ba161dd8352f61d18924f3149a2d48f440892a79548d80a031a1
font_02_sfnt_off00011aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA5 11324 bytes
SHA-256: 177a276f8841100f23892da2a8bd854e73714d355658ca7d26070fa0f5bf7f5d

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