Malicious PDF — malware analysis report

Static analysis result for SHA-256 3379807ceb199ce8…

MALICIOUS

PDF

73.8 KB Created: 2021-04-24 15:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 28af37efb2d19c97c337043f28167905 SHA-1: e0144cfece452129dad615fc50da17bf01d2bb73 SHA-256: 3379807ceb199ce828e1f66a4cd74a3f59dbdb9b5efe16f36c270971ddad1bf5
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicating a link farm or SEO abuse tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the nature of the heuristics point towards a phishing or redirection scheme, potentially leading to further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=verbos+en+ingles+con+su+pronunciacion+y+traduccion PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371272/normal_60497efcb8362.pdfIn PDF document text
    • https://jaradaka.weebly.com/uploads/1/3/0/8/130813635/nifesubojivota.pdfIn PDF document text
    • https://jokanile.weebly.com/uploads/1/3/5/9/135962808/zugub-zomafubixesefup.pdfIn PDF document text
    • https://fejovixojik.weebly.com/uploads/1/3/4/3/134333762/7456726.pdfIn PDF document text
    • https://cdn.sqhk.co/vekazedivipi/UxhdgjQ/23782331092.pdfIn PDF document text
    • https://bojewozawix.weebly.com/uploads/1/3/4/3/134321988/d8a6df03740.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_604f7aebec99a.pdfIn PDF document text
    • https://xexomogaju.weebly.com/uploads/1/3/1/4/131438449/1a210.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403948/normal_6007e12f82588.pdfIn PDF document text
    • https://cdn.sqhk.co/ranetixeba/ZjhihfX/18036081532.pdfIn PDF document text
    • https://silepokow.weebly.com/uploads/1/3/4/3/134366863/5246523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_605bc13f023ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365659/normal_5fdc8290bac0d.pdfIn PDF document text
    • https://radotarurejatu.weebly.com/uploads/1/3/1/6/131607565/kewasez-jepodoj-gupan-dujarezikiwis.pdfIn PDF document text
    • https://cdn.sqhk.co/wanadujogo/g3F89P2/mtn_momo_agent_form.pdfIn PDF document text
    • https://sibitolifi.weebly.com/uploads/1/3/4/7/134732274/51552f5d9.pdfIn PDF document text
    • https://nedixizudunosil.weebly.com/uploads/1/3/1/4/131483200/3221552.pdfIn PDF document text
    • https://cdn.sqhk.co/juzosugun/pjcFhjA/pizerewukasalukut.pdfIn PDF document text
    • https://betetaguzom.weebly.com/uploads/1/3/2/3/132303315/f84a986133225.pdfIn PDF document text
    • https://cdn.sqhk.co/detazido/XwhzBjh/76137716427.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_4aad3233690a44de8426bf4712f52800.pdf?index=trueIn PDF document text
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_398ad6b36b444038beac1ea870cac0a7.pdf?index=trueIn 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_off0000e0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E9 5448 bytes
SHA-256: fd6d9ccee47704d33dc30fd83144062ba0fdb91f799de4545ccdbb074fbb0c89
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 11164 bytes
SHA-256: 991778d9350928b793810094969d661b01f58142bfcb960d1c251b0baac6e351