Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25bbd8dfc6768b1…

MALICIOUS

PDF

145.1 KB Created: 2021-05-20 21:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 00371100007b9fa22a1c6d69c412e112 SHA-1: d7aea59e948cc03dd188be39916e07edd840d90e SHA-256: e25bbd8dfc6768b13938421541ab656aa5d6122ac6eadcab00f5750d4ffc2b4f
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to educational content, likely a lure to disguise the malicious intent of redirecting users to URLs like https://pelibifir.ru/strik.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://pelibifir.ru/strik?utm_term=realidades+2+capitulo+2b+prueba+2b-3+preterite+of+regular+verbs+answers PDF link annotation
    • https://nevedafixi.weebly.com/uploads/1/3/1/3/131398567/5657327.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_6010e60ec37b2.pdfIn PDF document text
    • https://veralekixa.weebly.com/uploads/1/3/1/0/131069874/874b2ddf4.pdfIn PDF document text
    • https://soruxepamoni.weebly.com/uploads/1/3/5/9/135992355/luparikeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374839/normal_5fe7823a2216c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460063/normal_5ff8fd8cbf767.pdfIn PDF document text
    • https://bowineno.weebly.com/uploads/1/3/4/8/134868267/3743504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_601fa3d031b10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407996/normal_60681c30c5696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465543/normal_601ee37ac6ed4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484805/normal_6029ac91bbc0f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478926/normal_6039e641f2690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_602c3550e8286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388426/normal_60548b489e34e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418391/normal_60430b6eeab27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483070/normal_5fd3b2c63c216.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476002/normal_5ffda6e0a463c.pdfIn PDF document text
    • https://lapobozitex.weebly.com/uploads/1/3/5/3/135305834/paruf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/scrivener_windows_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xanunafojuloki/navik.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/tippmann_98_custom_m249_saw_stock.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_off0001f38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F38C 5948 bytes
SHA-256: c2c6b19830d500cc59c4cc9f5fee0c3962f3c18c79bb519576e84502b0b4b4fc
font_01_sfnt_off000207f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207F5 14176 bytes
SHA-256: ab8bbf4c7b45004c104314239cdb9e9b5e9d63ef2544f45a3bc88db666efefca

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