Malicious PDF — malware analysis report

Static analysis result for SHA-256 8619f886368541fb…

MALICIOUS

PDF

76.6 KB Created: 2021-03-08 01:42:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 60a611ee5b954900d28547c759e597b6 SHA-1: 084ee35b4c80a7a3845314e7e86348a7cd6d918d SHA-256: 8619f886368541fb511beb7a45d093a1f0ed8a07510ef283e893c5b944f0e524
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the structure suggests the document is designed to redirect users to potentially malicious content or for SEO spam purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=the+everyday+writer+2016+pdf PDF link annotation
    • http://medtechnika1.ru/helly_hansen_life_jacket_size_guidegcs80.pdfIn PDF document text
    • https://tatogupuragafa.weebly.com/uploads/1/3/4/0/134096405/kisuwigel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382972/normal_60173ed2bab36.pdfIn PDF document text
    • https://lorebanoga.weebly.com/uploads/1/3/0/7/130738704/4212083.pdfIn PDF document text
    • https://cdn.sqhk.co/loxowopiv/Y91tHQz/living_room_furniture_for_sale_at_big_lots.pdfIn PDF document text
    • https://wegudogixudefup.weebly.com/uploads/1/3/1/4/131438345/sonuvekafugek.pdfIn PDF document text
    • http://smirno.life/jerarquia_de_operaciones_ejerciciosd2d5h.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/hgjchfn/70955617435.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449604/normal_5fe12b46d8744.pdfIn PDF document text
    • https://boxijapemisavar.weebly.com/uploads/1/3/0/8/130874030/20d925.pdfIn PDF document text
    • http://tiktokfrance.fun/investing_in_duplexes_triplexes_and_quadsa7g9v.pdfIn PDF document text
    • https://vuxemirisem.weebly.com/uploads/1/3/1/4/131453034/1705268e5f2b42.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/4hegdjf/sufee_admin_school_and_coaching_management_app.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/mhieMa2/xafelagagizom.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/13eb781663cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463808/normal_6000ade7299ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jadere/94675863877.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/jarhead_3_the_siege_parents_guide.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_off0000efd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD8 5600 bytes
SHA-256: f8227f4247a3a15d0c7119c60228a820dcd2b0397f62eb40b150c427d2b844b0
font_01_sfnt_off00010305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10305 10112 bytes
SHA-256: d61ff591c05c3d77734a8ecba249b9569c607f85602dd955c6d37da19cb29aed

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