Malicious PDF — malware analysis report

Static analysis result for SHA-256 0255549bccaf3689…

MALICIOUS

PDF

68.7 KB Created: 2021-05-31 23:35:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae2a56aa2cd69ae558c4a32db5aa21ef SHA-1: 18f736d394b68d729259ecc855c80510ae5abd71 SHA-256: 0255549bccaf368968296827446b7c425853e5dd04c18e08c2321fac414b72fe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external links, indicating a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

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.
  • 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://krisoc.ru/pbw?utm_term=upstream+intermediate+b2+workbook+pdf+free+download
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/06549ed2bc.pdf
    • https://xonalofogikovor.weebly.com/uploads/1/3/4/3/134372302/1dd3d0a6.pdf
    • https://puxekubokoru.weebly.com/uploads/1/3/4/6/134683715/48714.pdf
    • https://dejegudiferu.weebly.com/uploads/1/3/1/8/131857494/9ddafceed00a4a.pdf
    • https://velumosatowe.weebly.com/uploads/1/3/4/8/134883763/nenave.pdf
    • https://semufevesi.weebly.com/uploads/1/3/4/7/134733881/vezajodojodiladikub.pdf
    • https://texexavif.weebly.com/uploads/1/3/1/4/131454683/rabikeraseli.pdf
    • https://weworikifuga.weebly.com/uploads/1/3/4/5/134515792/c190475b.pdf
    • https://xazatawivofudod.weebly.com/uploads/1/3/4/3/134313500/add54.pdf
    • https://cdn-cms.f-static.net/uploads/4496585/normal_6046f0dbf251c.pdf
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/75c8e50eb163996.pdf
    • https://sazotavivi.weebly.com/uploads/1/3/1/1/131164406/vilizifif-domezoke-gunimi.pdf
    • https://tafibukazun.weebly.com/uploads/1/3/5/4/135400045/sefosovagomavon_vixebujotabito.pdf
    • https://fumunavizagoz.weebly.com/uploads/1/3/4/2/134235019/41b0de79172b1.pdf
    • https://cdn-cms.f-static.net/uploads/4391037/normal_6044929415a62.pdf
    • https://wapavamo.weebly.com/uploads/1/3/1/6/131637186/rivimu.pdf
    • https://fujidefabez.weebly.com/uploads/1/3/4/5/134512048/senif.pdf
    • https://cdn-cms.f-static.net/uploads/4409396/normal_6025069b1a6a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tazijebep.pbworks.com/f/abecedario_en_ingles_con_imagenes_para_imprimir_letra_por_letra.pdf
    • http://viluxese.pbworks.com/f/31474290593.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_off0000d02d.bin
231ff46da05568f5252ba3b004505f4e4a92460700393051b7944176444f6be5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 5608 bytes
font_01_sfnt_off0000e33d.bin
5918c9814ebbcbffbdb3be799d128afb140955df349941e662f130eea6f64922		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE33D 9824 bytes

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