Malicious PDF — malware analysis report

Static analysis result for SHA-256 1504d695863aba1c…

MALICIOUS

PDF

77.9 KB Created: 2021-06-01 20:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 654bcd5b13214d687e8f5b3ed88b3c51 SHA-1: d01007de8e89d1b45ac51336adc42a1217361971 SHA-256: 1504d695863aba1cef0a323ffe0272b28c55969908b80d69b1b636b2e6918694
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to obscure malicious content. The primary URL, 'https://archism.ru/pbw?utm_term=download+100+000+us+email+list+free', indicates a lure for downloading a file, likely malicious given the ML classifier and ClamAV detection. No scripts were extracted from this sample.

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://archism.ru/pbw?utm_term=download+100+000+us+email+list+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380211/normal_6066665432d5f.pdfIn PDF document text
    • https://lifezudo.weebly.com/uploads/1/3/0/7/130739479/sudobufaruker.pdfIn PDF document text
    • https://wevoforu.weebly.com/uploads/1/3/4/5/134591306/bogiw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486963/normal_602e2138bed2b.pdfIn PDF document text
    • https://gaxatibixowoki.weebly.com/uploads/1/3/1/4/131452935/dexasivatebonel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365583/normal_5ff89ecb3cfb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417531/normal_605885643e87c.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://poxanoralanu.pbworks.com/f/86341846942.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ba7025d-91c7-432f-958b-f8b45e77bcec/gutezaxoxuxen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a21271e-9218-4568-8471-927e15cd47a0/68621446525.pdfIn PDF document text
    • http://dejimebez.pbworks.com/f/zobosituwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8ecd423-fdd0-49dc-a7e4-5337dc68fa44/91033643663.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bb9f4db-3099-4c45-abe1-a547751c13ea/vabafikubenir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf7d97a8-3692-4629-b992-3935dcb8e914/8587720910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dc83303-6186-42fd-99b8-6901efc4e974/woferidupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fd6ae4f-b681-4344-87da-b7011712665d/82974137563.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3e37846-282b-4377-ab26-7b3bfc511952/the_secret_life_of_plants_movie_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e76e7e4a-02af-4cc0-ba38-7fdcc86a41c0/where_can_i_buy_piano_books_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/865e1a33-47cf-4266-b872-59cbdec1b61b/zezagofirezewelov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/253e0611-e4e3-494c-9d5f-5109e6c9ffdc/99789947895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23a4bf51-7d7d-4c71-aaab-45bfe3fff99a/92987891483.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_off0000e46d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46D 5220 bytes
SHA-256: 96def5f922d0fdfa7f31cc821ef5f1f4029d80c11959b26ed50a39f3b23b1d9a
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 11152 bytes
SHA-256: f36b2fbd5f2abc80518d52f1297eecf2b3912851c71deb42f73fd57160f80ee3
font_02_sfnt_off00011c2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C2C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3