Malicious PDF — malware analysis report

Static analysis result for SHA-256 a626c953920d8e5a…

MALICIOUS

PDF

74.1 KB Created: 2021-02-25 06:21:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e5a36912a6e9aaa0603f27757f169481 SHA-1: d2e5c371b2d7a7e83a233909e3d52e3862a006f9 SHA-256: a626c953920d8e5a5d4c17f26c2063ef915f12cfd6d11563ba16ab14e2a91bec
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a PDF link farm, with one prominent URL pointing to 'maypoin.ru'. ClamAV and ML classifiers strongly indicate maliciousness, specifically classifying it as a phishing or trojan PDF. The embedded links suggest an attempt to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://maypoin.ru/strik?utm_term=good+transitions+for+second+body+paragraph PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5fdc17580b5e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_5fc7798799517.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500430/normal_5fede0570908f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420454/normal_5fc740a73041c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391634/normal_5ff01f64ac255.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417988/normal_601f857d02819.pdfIn PDF document text
    • https://vipukawolatu.weebly.com/uploads/1/3/4/4/134486161/9759037.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392451/normal_5ff01c8624a4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_5fd0f11d09042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_6018c14cea6c8.pdfIn PDF document text
    • https://wubuzafovotul.weebly.com/uploads/1/3/0/8/130814439/pisopalaki-puvagekunalu-novegome-sowov.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/8f4331de4aeefec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409102/normal_5fdb67019d575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_5fd7d98fac5cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451350/normal_5ff3aa3012874.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wusanobe.rf.gd/47800606872.pdfIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/best_way_to_cut_fake_stone.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/tajajuxoxudozeba.pdfIn PDF document text
    • http://mowovojedux.epizy.com/lafejosuxi.pdfIn PDF document text
    • http://rulopumo.epizy.com/13042456424.pdfIn PDF document text
    • http://bebokele.rf.gd/oracion_de_la_biblia_catolica_salmo_91.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_off0000e44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44C 5656 bytes
SHA-256: f856a16218188f73b3a4916f541a95ef22c81d3bd75df43941fd38cd64c67aac
font_01_sfnt_off0000f78a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78A 10460 bytes
SHA-256: ff30c156e1a60123043eccc33a54bbdc661f61efc21184d86f4c03ce7a4ea9a5

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