Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3572188c17005bf…

MALICIOUS

PDF

96.1 KB Created: 2021-06-14 08:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 788d5e393f2a2abf750b64ad4536a579 SHA-1: cafd493b0fe191411cd03db5023b86c0779ff509 SHA-256: e3572188c17005bfa4e410a5d604d04a1dafcadf27dc1bf8651f0425a9487a22
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'xajibur.ru', suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, contains references to 'citation machine chicago format' and 'wkhtmltopdf', indicating a potential lure to a fake service. No scripts were extracted, but the PDF structure and embedded URIs strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/123?utm_term=citation+machine+chicago+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455894/normal_6028c5c139979.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485001/normal_5fc6712b91c66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462736/normal_6056ee63dba9d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380701/normal_60375c886bcf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_602fe9f747185.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471958/normal_6017ce62e7c7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379731/normal_6064c707108d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489734/normal_5fed3ed4eb56f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_600d47727a36f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415754/normal_60c5303649517.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_6032203a36ca9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412573/normal_601a04eb146cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_5fdbde47e47f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_60539d248bfe7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://finatin.pbworks.com/w/file/fetch/144489903/40835115309.pdfIn PDF document text
    • http://kumarifili.pbworks.com/f/cbt_for_adolescent_depression.pdfIn PDF document text
    • http://guronavageba.pbworks.com/f/9661398423.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144426552/98756649209.pdfIn PDF document text
    • http://wetavun.pbworks.com/w/file/fetch/144914790/pokemon_coloring_pages_scorbunny.pdfIn PDF document text
    • http://rimikupababo.pbworks.com/f/estadistica_descriptiva_libros.pdfIn PDF document text
    • http://wasazejis.pbworks.com/w/file/fetch/144803802/59141156220.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/alight_motion_pro_apk_2.5_1_mod.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/nukizuku.pdfIn PDF document text
    • http://sufizilofab.pbworks.com/f/olin_ross_sound_system_or860_manual.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_off00013bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 4992 bytes
SHA-256: 8ea76a5ec7acd4dd2572b2fd41de8d1b82e4fef57dc7fde1b5df87c42b4b9f13
font_01_sfnt_off00014c97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C97 11252 bytes
SHA-256: 0fd41345ed8f2fb727ef9f6a4e39d607ca8710510055ba88caddf3c7ef5d0216

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