Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a49c7653551ac5…

MALICIOUS

PDF

85.4 KB Created: 2021-03-16 09:08:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ec273c7b6938d7e13498ca2deb187120 SHA-1: c7533bd5d400159b7f94c5fd73008e358e6bb345 SHA-256: e4a49c7653551ac5412904372c784c90fe8ade811c1861b9f9c3db73635cf0de
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://jacksth.ru/strik?utm_term=rodrick+rules+movie+cast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386622/normal_603391651755b.pdfIn PDF document text
    • http://waxawazurutane.22web.org/what_is_burger_sauce_made_of.pdfIn PDF document text
    • https://gixovazaviv.weebly.com/uploads/1/3/5/9/135982549/f41a4e5d2d7ee.pdfIn PDF document text
    • https://betisifi.weebly.com/uploads/1/3/1/4/131438474/bonimax.pdfIn PDF document text
    • https://puwowuxavuz.weebly.com/uploads/1/3/2/6/132682233/mukedenazujaluporelo.pdfIn PDF document text
    • https://cdn.sqhk.co/polidupokasu/DjcyYCs/44135064300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469116/normal_60128706d6576.pdfIn PDF document text
    • https://tikodukika.weebly.com/uploads/1/3/0/7/130776738/fofugozudetoranoke.pdfIn PDF document text
    • https://cdn.sqhk.co/birenejar/4hddZkf/gun_strike_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_603508507820e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472488/normal_60034a0933444.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478952/normal_5fcdc2e5e9788.pdfIn PDF document text
    • https://gidipefodato.weebly.com/uploads/1/3/5/3/135348522/paxasulu-digeroza-kigazajebimole.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/13070e69-79dc-4191-a07d-562f7240100b/is_defending_jacob_one_season.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e328c839-5dee-4f35-b290-26286344cf10/22823505578.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/157cd922-2790-40ab-bae8-5d375f211827/is_a_4_qt_crock_pot_big_enough.pdfIn PDF document text
    • http://lotizogu.epizy.com/caderno_de_desenho_infantil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a056e3b-edbe-4617-9e10-e6957304f8af/74530814215.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26fb5de-e19c-4f04-9cae-8214536c4c7a/how_long_does_iso_27001_certification_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c547665-3157-4e41-be48-1982cef3f0f5/new_king_james_study_bible_thomas_nelson.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8720b27-4c31-449c-a02b-3185f3f6ffe7/ritofulaxidisej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/193f173f-39db-4cc3-b626-2cd1bc2257c3/suxik.pdfIn PDF document text
    • http://vaforapibasaw.epizy.com/21833785917.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ca714eb-6c7a-4c19-9ace-fab1131762f9/56112331445.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_off00010d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D50 5216 bytes
SHA-256: e6b1dc82ffdb5b4c30c6f8dad9335e4f189ccaf890d1989a11f6c75dc2eb7910
font_01_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 12120 bytes
SHA-256: baab37dd5e72347ce59167ec5dc22750d53ce4d3ad3a221344afd0845004a42e