Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5e9198828399b0…

MALICIOUS

PDF

75.4 KB Created: 2021-04-22 12:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 617761a9f2d0fd70634e45a342ceb449 SHA-1: 751501a848b3c920af4142e667c02b60ee1ef95b SHA-256: de5e9198828399b0a53865c2e688d9e08d7a6794e1c743f9a8cdb637d2beb2a0
126 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous URLs suggests a potential for distributing further malicious content or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://bologen.ru/strik?utm_term=interior+designer+near+me
    • https://cdn.sqhk.co/liregevo/lOq5hg3/zoboxixaxunuza.pdf
    • https://kibibobufusasi.weebly.com/uploads/1/3/4/6/134643218/dozebixu.pdf
    • https://cdn-cms.f-static.net/uploads/4420934/normal_6064bd35e8835.pdf
    • https://wutaleba.weebly.com/uploads/1/3/5/3/135390467/4240320.pdf
    • http://stat-index-co.com/vonavanikigapopawubaratw8b5f.pdf
    • https://cdn.sqhk.co/zagawodijimo/cGgggh1/88626961685.pdf
    • https://wufisosudima.weebly.com/uploads/1/3/0/8/130874090/rerijivotolutogasi.pdf
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdf
    • http://formverifiedbadge.com/nezabidudefopapativiwivibwi6s.pdf
    • https://static.s123-cdn-static.com/uploads/4457014/normal_5ff299327dde7.pdf
    • https://cdn-cms.f-static.net/uploads/4490244/normal_6023ce8f30376.pdf
    • https://cdn.sqhk.co/gaxumisi/hljgZhd/short_life_2_y8.pdf
    • https://static.s123-cdn-static.com/uploads/4494452/normal_5fcb34394d06f.pdf
    • https://farigelud.weebly.com/uploads/1/3/4/2/134266281/faxuxakewe.pdf
    • http://tinivoze.22web.org/cerebral_angiography_book.pdf
    • https://cdn-cms.f-static.net/uploads/4499285/normal_6019855180447.pdf
    • https://cdn.sqhk.co/disegivoji/0EhdQha/ivan_boesky_now.pdf
    • http://denizan.com/boat_parking_3d2s70u.pdf
    • https://gepidoduxaw.weebly.com/uploads/1/3/5/3/135324144/poxarotojovuluk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cf268418-7549-4780-9cff-e39e61b5276c.filesusr.com/ugd/0b1cf2_8e975ee543464e9aaaa71cf0fa42473d.pdf?index=true
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_51d56e5083964ecbab52be97d65a5254.pdf?index=true
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_3e78cb793d4e4862b95b728b2a74435a.pdf?index=true
    • http://tebafifara.rf.gd/ejercicios_numeros_romanos_2_eso.pdf
    • http://vawolanuxoreg.epizy.com/lilasilelotak.pdf
    • https://1dfef493-bba3-4db0-89f7-7cef958ceea2.filesusr.com/ugd/3dbeb3_00235119b56948deb9a3c88f91400407.pdf?index=true
    • http://lowadof.epizy.com/service_engine_soon_light_flashing_gmc_envoy.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a5.bin
f144f6346baf2eac9c73e901a01507f3ce9d5bdbc319a219e2a2c3394a473355		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A5 5052 bytes
font_01_sfnt_off0000faba.bin
d93b875d37cbb4104c2adc649b9e4bf4f987b3c299acb35eb47ca0f5062670b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFABA 10444 bytes

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