Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1e2d1f15f56c056…

MALICIOUS

PDF

75.6 KB Created: 2021-02-27 18:57:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 0081ae2ac0a862f786cf651077a89bd8 SHA-1: f8f249af1845742b29617af45d76792a05f4ed84 SHA-256: c1e2d1f15f56c0560e9b2abfe9bcce2195f92ddf1760cb6a87c6367f3d833c2a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://resalured.ru/strik?utm_term=graphs+of+sine+and+cosine+functions+calculator PDF link annotation
    • https://cdn.sqhk.co/setawigiz/ZjdbQja/truck_driver_city_crush_game_apk_download.pdfIn PDF document text
    • https://divetuguwopad.weebly.com/uploads/1/3/0/7/130739619/tamazowakije-kedazaga-sadufukegor.pdfIn PDF document text
    • https://pigasuranebuja.weebly.com/uploads/1/3/4/4/134459694/5a19f8645e8ff2.pdfIn PDF document text
    • http://sdek-24.cc/milady_chapter_14_theory_workbook_answers598d8.pdfIn PDF document text
    • http://alisaborodaenko.design/80451079501crzqy.pdfIn PDF document text
    • http://damapilob.iblogger.org/pejeneke.pdfIn PDF document text
    • http://kegujusotuk.iblogger.org/90927720386.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/elheShe/64322092014.pdfIn PDF document text
    • http://firstdoctor.xyz/can_you_learn_4_languages_at_onced4f00.pdfIn PDF document text
    • http://betijeduw.getenjoyment.net/21191316829.pdfIn PDF document text
    • https://sevenunoxesu.weebly.com/uploads/1/3/4/3/134341304/2528af33bede3a1.pdfIn PDF document text
    • http://fruit-italy.space/zozusuwolinekanega7v7mz.pdfIn PDF document text
    • https://wubedalenab.weebly.com/uploads/1/3/1/3/131383767/xekuwifibo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bolirazebaf.myartsonline.com/kixovemeno.pdfIn PDF document text
    • http://mepivew.epizy.com/49606245716.pdfIn PDF document text
    • http://fefolitaweni.epizy.com/30731664942.pdfIn PDF document text
    • http://misebupafavo.rf.gd/6243201940.pdfIn PDF document text
    • http://zujebagita.epizy.com/capsa_susun_apk_free.pdfIn PDF document text
    • http://sulovibox.epizy.com/narufopoki.pdfIn PDF document text
    • http://fidepogomuvi.rf.gd/soxivijiw.pdfIn PDF document text
    • http://kafakakuwif.rf.gd/games_2018_for_android.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_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 5272 bytes
SHA-256: c6be587606b286c22b7d8d5d6b4ab09937fed835071c329f8ca864a5a8e85415
font_01_sfnt_off0000fb7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7D 10828 bytes
SHA-256: b5e7cc7445a712d9e49f3bb32ab833715c71251eae667c8b4a3b0401abf0bc90

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