Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c16c5adf36221c…

MALICIOUS

PDF

73.3 KB Created: 2021-03-29 22:30:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: bd813c5cbcb1e8f56224515b3ee88049 SHA-1: ef2a66d6b1fd13cfdf9e4d01df657b459565f9f1 SHA-256: 84c16c5adf36221cffe63518f5156b9b07fcb6e1322843c83f0f1b3440699b8f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate this malicious intent. Although no scripts were explicitly extracted, the presence of external links and the ML classifier's high confidence score point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=algebra+geometric+sequence+worksheet PDF link annotation
    • https://cdn.sqhk.co/dasisogi/ibUKiig/96359176626.pdfIn PDF document text
    • https://cdn.sqhk.co/jugomuzuteb/Khghfib/wexisugaxizugolagi.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/riviserokebupozemef.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/rental_bond_lodgement_form.pdfIn PDF document text
    • https://cdn.sqhk.co/bidekidarub/dShbHjb/loxutikegepovovirava.pdfIn PDF document text
    • https://cdn.sqhk.co/gixenako/dhSw9hb/62459611094.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453105/normal_601c85dc7640e.pdfIn PDF document text
    • https://cdn.sqhk.co/desogepupema/gjT7A5Z/mi_bebe_dia_a_dia_apk.pdfIn PDF document text
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/tepitugakalax-jorapipaj-nojutaredusesok-xuvudofuxelep.pdfIn PDF document text
    • http://rixadixiji.scienceontheweb.net/91994355947.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393628/normal_60491d6e21920.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489607/normal_5ffa691807e8d.pdfIn PDF document text
    • http://gezetola.scienceontheweb.net/sutedavomumabukagajarigub.pdfIn PDF document text
    • https://lejegibovijidup.weebly.com/uploads/1/3/1/4/131438293/6007316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zifugonela.epizy.com/75554641846.pdfIn PDF document text
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_40a887e955464ca8aeb6a4a998d45962.pdf?index=trueIn PDF document text
    • http://zodesozagusi.rf.gd/diagnostico_educativo_definicion.pdfIn PDF document text
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_fc7365b357d0492abb260d5d60e1161f.pdf?index=trueIn PDF document text
    • https://237a2310-9536-43ad-add1-fe73b840a51a.filesusr.com/ugd/8b319d_167c4a9b4ea84c0bbe5e54a067142901.pdf?index=trueIn PDF document text
    • http://ketonabewuzove.epizy.com/40297737587.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_off0000df8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF8F 5624 bytes
SHA-256: fb5fc02cf8355b5dcf107b5d5c8b06f93f45ff1b4c3753c774c48f8442f2284b
font_01_sfnt_off0000f296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF296 10924 bytes
SHA-256: e3f2daef89f91b240776b204736e1e4cf9e0bfa33d6494f81e7e2c323ba7643a

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