Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7a41f3fa484c930…

MALICIOUS

PDF

103.6 KB Created: 2021-06-14 00:14:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1bc2bae6c7b703711f0ac26f9bd89d60 SHA-1: 05ba9e7ac16c223de3c5264b039ac14b651bce93 SHA-256: e7a41f3fa484c930c497f5d5f1e165a29ae512a86f160e5a298d6c5556d173c3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports malicious intent. The document body, though heavily obfuscated, contains references to 'yellowstone season 3 episode 4 paramount' and 'wkhtmltopdf', suggesting a lure to a fake content page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nomylo.ru/pbw?utm_term=yellowstone+season+3+episode+4+paramount PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385011/normal_603bc8b464fc6.pdfIn PDF document text
    • https://kefavemi.weebly.com/uploads/1/3/4/0/134042724/vupega.pdfIn PDF document text
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/senafune-solubure.pdfIn PDF document text
    • https://pizakatunif.weebly.com/uploads/1/3/1/8/131856177/sebeganalipebez.pdfIn PDF document text
    • https://lenudigibelap.weebly.com/uploads/1/3/7/4/137499492/6021427.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494440/normal_60c2db345603c.pdfIn PDF document text
    • https://fozaronu.weebly.com/uploads/1/3/5/3/135349809/8478826.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vikiruji.pbworks.com/f/gulodefozojupetugejoxezag.pdfIn PDF document text
    • http://todenulaw.pbworks.com/w/file/fetch/145133355/kuvemidopanise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3065eb6c-6432-445c-80cd-2de5d0d894a8/24321431804.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476cfbf5-dd10-4e08-991c-16b7e225ce7d/kogatovitikivonidazalabu.pdfIn PDF document text
    • http://garigor.pbworks.com/f/86387308949.pdfIn PDF document text
    • http://sawanixum.pbworks.com/w/file/fetch/144522615/angles_of_depression_and_elevation_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6ec7f6-3b8e-487d-936c-4247246e3c3a/jolojodax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66a18604-6f5d-4ece-9457-26aa62a69cab/electronic_air_cleaner_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bad7a4af-84b3-44af-87d9-e1ac2a0904e5/76992861303.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1c7abb8-f1a9-4de2-b23f-273eb3a58c0a/is_it_in_my_blood_worksheet_answers.pdfIn PDF document text
    • http://taxoxuf.pbworks.com/w/file/fetch/144661575/wafiwarolamax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b215ebc-69cd-4251-9286-59df6f9b8af3/how_to_repair_oil_filled_radiator_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6010450a-da79-416c-9ab3-f612e280249f/niwexawomuroti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa465c18-b448-4a86-84a7-5bcf67db8126/48688878506.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_off000157df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x157DF 5412 bytes
SHA-256: 37418116874077d2555bc1dd77bb329fb43dc88c6ba59b25f7d7d50832a55a94
font_01_sfnt_off00016a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A4A 11484 bytes
SHA-256: 2d0b429a40d3460a88347e48f27a35eeb6acb10cb944a8cacf07392a02455bfe