Malicious PDF — malware analysis report

Static analysis result for SHA-256 b441e7e62c4f2dd8…

MALICIOUS

PDF

73.7 KB Created: 2021-03-03 13:21:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 5a5d22b060ca81726b23238701d765d9 SHA-1: f028345f2a420928f0f0617a57e841280c06cd30 SHA-256: b441e7e62c4f2dd84e3258387428cd978c8deba3a4637fe0e995092df0577612
184 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagging it as a redirector to known malicious infrastructure. The document body, though partially corrupted, contains text related to 'Factory reset wd my cloud ex2 ultra' and is associated with numerous embedded URLs, many of which point to disposable hosting or potentially malicious domains. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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://crophysi.ru/strik?utm_term=factory+reset+wd+my+cloud+ex2+ultra In PDF document text
    • http://zakapanu.iblogger.org/62757534611.pdfIn PDF document text
    • https://gijosugomigul.weebly.com/uploads/1/3/4/3/134317853/1562db8.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/kWjjaTc/ford_racing_blocks.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/c3eipAc/83873033110.pdfIn PDF document text
    • http://1xbet-registrat.site/84671713470km3k8.pdfIn PDF document text
    • https://cdn.sqhk.co/tedefoso/5ifgffg/bawavofubifurixobep.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485822/normal_5fd7d0426353a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490377/normal_5fd68c53f26fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460070/normal_601582b1c500f.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/zwlkgeR/kevanenagafariv.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/htKgiig/20417246271.pdfIn PDF document text
    • http://nivanugifur.iblogger.org/apple_ipod_nano_7th_generation_charging_cable.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404116/normal_5fd1b38bb084b.pdfIn PDF document text
    • https://kopabiziruzoxol.weebly.com/uploads/1/3/1/4/131406592/laponejowuboj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_602b887c849e0.pdfIn PDF document text
    • http://blacktea.space/29811568326qvl9r.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
    • http://pagujuropiwadiv.rf.gd/xizekajugofurilatitita.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD739 5164 bytes
SHA-256: 9b2726e3634418baf83f0569b581c4c5bacb76d90afcd77e3623e5f508b1bf5d
font_01_sfnt_off0000e8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E7 10112 bytes
SHA-256: a08065cf277e54014d677a83925dc6ad083f25d1ae25cb496ea97cb241fe2d3d
font_02_sfnt_off00010bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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