Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e6ec4077f6784f4…

MALICIOUS

PDF

90.8 KB Created: 2021-04-22 23:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f493721f61990f8422c8001394642703 SHA-1: 331533eacb39fec69764d780226f71ce8df53618 SHA-256: 2e6ec4077f6784f45610c4914b814d01a249e4096c1d5ba150a050e352769e20
126 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to exploit users by directing them to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://vilenefex.ru/strik?utm_term=bhagavad+gita+chapter+16+lyrics+in+tamil PDF link annotation
    • http://magic-world.site/mapa_asia_mudohchxd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366646/normal_60084ddca1894.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_602513a0b1de6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467576/normal_60373fdd909cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383471/normal_602d79dcc8dbf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392195/normal_606e538d54308.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408989/normal_600a6ed54fd5c.pdfIn PDF document text
    • http://triple-doska5.club/717747470473j9n5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463272/normal_601dda460e9c0.pdfIn PDF document text
    • http://fenofojerafama.22web.org/94484833766.pdfIn PDF document text
    • http://optamorem.com/daxivanituziwi3pw3n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408187/normal_601a837361ebd.pdfIn PDF document text
    • http://jatidozav.iblogger.org/wotugakiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381082/normal_603eab0817e74.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_e03779b8ef954b209df2a8733903320c.pdf?index=trueIn PDF document text
    • http://dilemewenebuzur.rf.gd/88926852881.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_b84be78ddd5245d99db4cd80f04eec4a.pdf?index=trueIn PDF document text
    • http://pisisagul.epizy.com/free_eviction_notice_template_ny.pdfIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_a2eae5ce01564e3691f88ebf20aabb8c.pdf?index=trueIn PDF document text
    • http://nixetatop.epizy.com/funanarekifijuvuwo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c170b2-4b85-4463-b136-c47b329eb643/53288038931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8082af8-11eb-4e80-b288-2427c9105340/35514143214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc13814-82ee-4db5-95c1-0728e5ec5962/bowoludepusepinosepewa.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_off00012101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12101 5904 bytes
SHA-256: 7f6685a01941c18a9c91b5fa3f89c5d907979c5a6e4461c7ba4e2c0eac7b8c8c
font_01_sfnt_off0001350c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350C 12524 bytes
SHA-256: 4d5e3c648427d49854656a23011bad58085a6929e5f4b384d3b807aaef575b14