Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3afcd044fb9b30…

MALICIOUS

PDF

70.6 KB Created: 2021-02-02 00:00:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 87224d1c1bbcf0405b75e5a34cf2c931 SHA-1: 7aeaece39330ed197c910e282e5cafafe85e1f87 SHA-256: 5e3afcd044fb9b30424c7d7df277759294f76939dbc9b345c408c05a0f2b2d1b
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with one pointing to a suspicious domain 'jottigo.ru' that is flagged as an external URI. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

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://jottigo.ru/123?utm_term=how+is+scarcity+related+to+competition+quizlet PDF link annotation
    • http://rrrrkkkkk.space/45263046163xne9s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_6005d0cf05202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421983/normal_60072522a304b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5fe384f0e0985.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445726/normal_5ff23d2279716.pdfIn PDF document text
    • https://dizuvojuxi.weebly.com/uploads/1/3/1/1/131163617/jileroroxujofo_temebir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489615/normal_5fe86c0616a3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423431/normal_5fe060e64d5f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476578/normal_5fd11ad22167e.pdfIn PDF document text
    • http://copyrightshelpscenters.com/asturias_guitar_duolua99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410983/normal_5fdac19a2123c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416939/normal_5fd1c8fe28c7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420902/normal_6014db1451284.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/827624.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428039/normal_5fe223638e8f4.pdfIn PDF document text
    • http://airbin.top/virgin_pulse_max_sign_inoeq95.pdfIn PDF document text
    • http://autolombardpro.ru/73122804051gfsy4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wufujudisu/vajoxiwuv.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/61145978999.pdfIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/bluestacks_3._56_android_version.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/kawituzujixilixevinure.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_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 5552 bytes
SHA-256: 49b56b05af43d585c5739162b8c518efa8fcc41c4b76643186bbd65782771bd8
font_01_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 12204 bytes
SHA-256: 911bce3c523c9efd43213e35f92314c9b9475c3e5ad94dfa621bb81802ed60aa

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