Malicious PDF — malware analysis report

Static analysis result for SHA-256 710ac9cf5d39da47…

MALICIOUS

PDF

78.7 KB Created: 2021-05-19 20:40:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0228772e6b952f7779ea3ffbce0c39bf SHA-1: 42155da20282fb7d8ff98992f70003592928601a SHA-256: 710ac9cf5d39da479c72ddec431e65dc8db5f144bb0a9d8ec9dca62311e53c03
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document, likely used as a lure to redirect users 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=oraciones+de+pronombres+personales+y+posesivos
    • https://petekebinipaz.weebly.com/uploads/1/3/5/3/135395272/supaseko.pdf
    • https://cdn-cms.f-static.net/uploads/4488336/normal_601198aad9faf.pdf
    • https://sopebanodi.weebly.com/uploads/1/3/4/0/134017095/5cad9a31880f.pdf
    • https://kawififelotus.weebly.com/uploads/1/3/1/4/131437833/517086.pdf
    • https://cdn-cms.f-static.net/uploads/4446921/normal_601e0bf4c2edf.pdf
    • https://static.s123-cdn-static.com/uploads/4443824/normal_5fcaafeb14d28.pdf
    • https://static.s123-cdn-static.com/uploads/4368494/normal_5fca87fb635fc.pdf
    • https://static.s123-cdn-static.com/uploads/4409405/normal_5febeff867b87.pdf
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff79c3d911ad.pdf
    • https://static.s123-cdn-static.com/uploads/4498678/normal_5fe5fbfaaf797.pdf
    • https://kekorozonositen.weebly.com/uploads/1/3/2/7/132710750/keralawupamoko-vigulusigub-winirum-nikutopoludij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/getizar/graco_fastaction_travel_system_with_snugride_30_lx_reviews.pdf
    • https://s3.amazonaws.com/mukutud/fonibofinip.pdf
    • https://s3.amazonaws.com/dazifozixawus/asseverazione_di_conformit_della_copia_cartacea.pdf
    • https://uploads.strikinglycdn.com/files/41f31472-4347-49b1-b363-deb3ae50517d/how_to_build_mental_toughness_in_young_athletes.pdf
    • https://uploads.strikinglycdn.com/files/1249a0e2-220e-4881-9def-c713e883ca26/24301801322.pdf
    • https://uploads.strikinglycdn.com/files/ac0dbfd5-0ef6-44ee-99d5-6ca41efcb683/xodujewipewepidolewikokuj.pdf
    • https://s3.amazonaws.com/rujimidujek/kixamujevig.pdf
    • https://s3.amazonaws.com/belopudevuzuza/nbme_practice_test_step_1_score_correlation.pdf
    • https://s3.amazonaws.com/nisiwanolom/chevy_volt_2018_manual.pdf
    • https://s3.amazonaws.com/fadobirak/44186976819.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/lerodenifupagomaduvi.pdf
    • https://s3.amazonaws.com/wolina/30675354058.pdf
    • https://s3.amazonaws.com/pugomonapoxuxe/bancroft_prep_school_uniform.pdf
    • https://uploads.strikinglycdn.com/files/babede40-bb44-4e29-b160-1e893fe1dc6a/how_to_export_garageband_to_imovie.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_off0000f126.bin
d7f6ce57658886d7456c5f4b5739c2d850cf27b678dce0d5870edf81fb5cf9df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF126 5548 bytes
font_01_sfnt_off000103ec.bin
a9ddc4bf16669255bc731b86445b6c225d535adfa2da7226789d9c207d0cfda8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 12140 bytes

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