Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9eeaa97a5e2a5f6…

MALICIOUS

PDF

114.7 KB Created: 2021-02-26 21:24:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6cd2dc597347c261b0fd7693a82bc01c SHA-1: 7493a22d7a428c63e945c9e20fd2bfa64fefecf0 SHA-256: b9eeaa97a5e2a5f697409d3948d208dd958be4add75f58b9ae9970f0f23709b7
244 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics as a malicious redirector and a link farm. It contains numerous embedded URLs, many of which are hosted on disposable domains or known malicious infrastructure. The ML classifier also strongly indicated maliciousness. The primary goal appears to be directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=vox+delaylab+vs+dl4 In PDF document text
    • https://kadibunafi.weebly.com/uploads/1/3/0/9/130969561/modixijox.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/c2teha6/numibebukakaziwizazoxapur.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/youth_football_playbook.pdfIn PDF document text
    • http://gakukuketisalum.scienceontheweb.net/kinuzijolu.pdfIn PDF document text
    • https://jegobegopij.weebly.com/uploads/1/3/1/8/131871729/0388a52.pdfIn PDF document text
    • https://pesuwoleze.weebly.com/uploads/1/3/5/2/135295903/fa91e8092d0b9c.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/wv9iibV/blaze_and_the_monster_machines_episode_list_wiki.pdfIn PDF document text
    • https://fusajebotiv.weebly.com/uploads/1/3/4/3/134320253/bibukez.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/Hjaidgd/paper_racing_tips.pdfIn PDF document text
    • http://zajakewezu.iblogger.org/bofugebunozufexujumeno.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/sivarolijosoj.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://monudoxufanexax.rf.gd/aws_cicd_terraform.pdfIn PDF document text
    • http://dimaninerif.rf.gd/tajibelo.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/appsync_android_tutorial.pdfIn PDF document text
    • http://fiwofitobuz.rf.gd/60334959660.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00015068.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15068 17252 bytes
SHA-256: 07db502d0202a64aae8a3c85f2f729925181501d544a193316aa892e76d05bef
font_00_sfnt_off0001343c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343C 2952 bytes
SHA-256: d8b907802410e675ceca2784509e58a9dae2947c1b2ad43e3e0c02687eabed47
font_01_sfnt_off00013eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECA 5144 bytes
SHA-256: dbb9750ce6b790ad4cec14ddf4ff606ee248c052a70b923ada81ea0c404d805e
font_03_sfnt_off00017e38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E38 12892 bytes
SHA-256: 981162a93285c0b91af2805c5c8081b7597549cff8ea2542dbc94f5eb4061242
font_04_sfnt_off0001a75e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A75E 16164 bytes
SHA-256: 1f1485d45a2ea89ebfabed4f7fb4135d84bcfbfd05085f769df41db444b85625