Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fce2a4b66676d44…

MALICIOUS

PDF

75.7 KB Created: 2021-03-15 03:55:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 011e61575f41f1aacb319f08135946b8 SHA-1: 40a88222070232fcd7114c156ff5c0f67c943851 SHA-256: 5fce2a4b66676d4404c2f006bd08ecb4bacd264a3c9b7cbc3b95dc627ec9402e
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ClamAV detection and ML classifier also strongly suggest malicious intent. While no scripts were explicitly extracted, the structure and numerous external links suggest a phishing or SEO spam campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://jumiwimov.ru/award?keyword=english+lessons+for+elementary+students+pdf PDF link annotation
    • https://fipogelijemebu.weebly.com/uploads/1/3/1/3/131398193/2538357.pdfIn PDF document text
    • https://ratesikumetu.weebly.com/uploads/1/3/1/1/131163578/4574499.pdfIn PDF document text
    • http://telgrm.site/wuwesejositolopumizexawifbzo2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494140/normal_5fe2159289572.pdfIn PDF document text
    • https://mesirurot.weebly.com/uploads/1/3/4/7/134706751/sofoguka.pdfIn PDF document text
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/worasolazifa.pdfIn PDF document text
    • https://modefijibig.weebly.com/uploads/1/3/6/0/136011483/bcb10dc02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_603ffc2d81896.pdfIn PDF document text
    • https://gulojisaxedux.weebly.com/uploads/1/3/4/5/134598876/jorubomuzutemafim.pdfIn PDF document text
    • https://pilopagitek.weebly.com/uploads/1/3/4/8/134856928/705877.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_5fee45ad902f1.pdfIn PDF document text
    • https://puzerufatuv.weebly.com/uploads/1/3/1/1/131163838/3638665.pdfIn PDF document text
    • https://lijepaxo.weebly.com/uploads/1/3/5/3/135324298/6712766.pdfIn PDF document text
    • http://help-nanny.site/tedotimi5ic2u.pdfIn PDF document text
    • https://kijujiwovijuk.weebly.com/uploads/1/3/1/4/131453096/6304306.pdfIn PDF document text
    • https://semufevesi.weebly.com/uploads/1/3/4/7/134733881/bugonir-rofapaj-xatibo-moseterapaduxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369802/normal_603bf357eaa21.pdfIn PDF document text
    • http://kino-vezde.ru/alan_wake_pc_game_full_versionm5fro.pdfIn PDF document text
    • https://nizedavigo.weebly.com/uploads/1/3/4/8/134879015/vuviwukalu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vefodipox.myartsonline.com/91608278656.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/diablosport_intune_i1000_vehicle_list.pdfIn PDF document text
    • http://bajekixizosi.myartsonline.com/invoking_angels_kabbalah.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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 5512 bytes
SHA-256: 5db3082d78cc8e51d488abb8fbde883c6f70d6c61e905a778f0f194f7c63810f
font_01_sfnt_off0000fd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8B 10528 bytes
SHA-256: 7ece5842c33b2ef5021c68b04a02c473f70b3c4880cc97ba717c255f12b0a44e