Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c65f44c68fc05ee…

MALICIOUS

PDF

65.0 KB Created: 2021-02-08 07:26:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: ea6922f9902237d8ebe6085003fdf3cc SHA-1: 9da972243960c0be959f0ecc835b03198b864375 SHA-256: 5c65f44c68fc05eec0d77a54a4da786b751e261f2e261c0f7004852fbb812c2a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the extracted URLs, 'https://jacksth.ru/123?utm_term=1999+nissan+maxima+manual+transmission+for+sale', appears to be a lure, potentially directing users to phishing content or further malware. No scripts were extracted, but the extensive link farm and high detection scores point to a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=1999+nissan+maxima+manual+transmission+for+sale PDF link annotation
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/tavumalakibeg-zofozobije.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/cihie5w/catan_piece_colors.pdfIn PDF document text
    • https://zisamezasebav.weebly.com/uploads/1/3/3/9/133997726/soligibiba.pdfIn PDF document text
    • http://wildber.store/english_to_bengali_alphabet59qp8.pdfIn PDF document text
    • https://paxubemimowam.weebly.com/uploads/1/3/0/7/130739876/vexuf_jivun_ditinutivuwagax.pdfIn PDF document text
    • http://sallehub.xyz/group_1_periodic_table_worksheet6sozf.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/h4VhiaX/at_t_global_network_client_error_412.pdfIn PDF document text
    • https://gagoduxo.weebly.com/uploads/1/3/1/4/131452981/kadobulim.pdfIn PDF document text
    • https://jumirusuvowelu.weebly.com/uploads/1/3/4/6/134632856/5a5ee6.pdfIn PDF document text
    • https://mewurotimopu.weebly.com/uploads/1/3/1/3/131381658/xefoxaxuvipopo.pdfIn PDF document text
    • https://dojinutek.weebly.com/uploads/1/3/4/1/134108596/7805810.pdfIn PDF document text
    • https://wuwebiwurumebil.weebly.com/uploads/1/3/1/1/131164488/578b3e5.pdfIn PDF document text
    • https://tonavamajarow.weebly.com/uploads/1/3/4/6/134694337/xodupetami.pdfIn PDF document text
    • http://itasummer.fun/vectric_aspire_torrent2s2yo.pdfIn PDF document text
    • https://cdn.sqhk.co/fexejikexew/jRRVtig/meaning_of_neighbour_in_american_english.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417405/normal_5fe157e35c2f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475739/normal_5fd7f8e415079.pdfIn PDF document text
    • http://superheatbelt.xyz/369842288833gluz.pdfIn PDF document text
    • https://soxoxalumowaju.weebly.com/uploads/1/3/4/7/134768556/985068.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c11c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC11C 5096 bytes
SHA-256: f401893d5d1090ad64ec77471c1a561a5f777841f72b13a531f5f6b823b7678d
font_01_sfnt_off0000d25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25F 10676 bytes
SHA-256: eed389a5720798f3a038288368f180085d02bb7d9a1753c115f36a8d732e4074

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