Malicious PDF — malware analysis report

Static analysis result for SHA-256 95054a56908632d0…

MALICIOUS

PDF

85.9 KB Created: 2021-03-19 21:00:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 0482a45db70539e5a6faa72c7bac28ee SHA-1: bc96e85526f4756fe85e8077946d55f88e74fb24 SHA-256: 95054a56908632d085b351c86825cad9637f2272de2fc3f6e59fe2ee8cc842d8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to direct users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URIs are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

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://xezojetit.ru/strik?utm_term=jazz+drum+beats+pdf PDF link annotation
    • http://kimokabif.medianewsonline.com/comparative_superlative_exercise.pdfIn PDF document text
    • http://lifizix.22web.org/triangle_congruence_worksheet_2014.pdfIn PDF document text
    • https://judenebubiz.weebly.com/uploads/1/3/4/6/134656374/rinuxukuxedoze.pdfIn PDF document text
    • http://dotixomovi.sportsontheweb.net/29374165573.pdfIn PDF document text
    • http://itasda.online/temofafosonedavofadov5suwj.pdfIn PDF document text
    • http://nelitip.22web.org/73572363736.pdfIn PDF document text
    • http://esparks.ru/xiperomuxi0d5kl.pdfIn PDF document text
    • http://auth02mobility.com/76193945999lqhaa.pdfIn PDF document text
    • http://pubgmobiie.com/editing_worksheet_for_class_10hn9rx.pdfIn PDF document text
    • https://gifedoku.weebly.com/uploads/1/3/4/2/134234788/dibojelufanumo_dafixatu.pdfIn PDF document text
    • http://eurofamily.pro/bowifegisijubifelinujuridp6xc.pdfIn PDF document text
    • https://bafexobis.weebly.com/uploads/1/3/4/0/134041027/3504319.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_3b03b4254359403098224833e1e5b5b8.pdf?index=trueIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_3233f5cb394243fb87490c2b3c8a6aab.pdf?index=trueIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_0401d1623620403da977a793c5dba524.pdf?index=trueIn PDF document text
    • http://mafofeguf.epizy.com/committee_meeting_minute_template.pdfIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_01c682865101424cbf5cd01597d3224e.pdf?index=trueIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_a0b87ab4c03c4f179339f8d868127bb2.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00011da1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11DA1 18656 bytes
SHA-256: 541f48a2bad63d64e1ea358d3bd8183f58cd786367087a269bb4ff3557309eb6
font_00_sfnt_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 4952 bytes
SHA-256: db50f572822ff6fbea8c703c54853c06ec9ff6856f6a9cd369966f72839b3295
font_01_sfnt_off0000f926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF926 10636 bytes
SHA-256: 6003f651539befe06113e0258963ce7ba580d902fc0c3b50190a8090a4b7603f
font_03_sfnt_off00013aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AAF 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3