Malicious PDF — malware analysis report

Static analysis result for SHA-256 90be6689cffbb475…

MALICIOUS

PDF

77.4 KB Created: 2021-06-06 23:22:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 64bfb34e7c589152dabd3373397fa458 SHA-1: aec21dbb345b56df01def9138dd45fc3aa500162 SHA-256: 90be6689cffbb4757f0e0bea72f4ade49456edb5cc995ab99d6c3547adb1795a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded content, though heavily obfuscated, likely serves to redirect users to these external sites, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://archism.ru/pbw?utm_term=nespresso+vertuo+capsule+guide PDF link annotation
    • https://rotugufe.weebly.com/uploads/1/3/5/3/135315725/rolago_gamunasanodo_xuwakujifu_vumekutod.pdfIn PDF document text
    • https://sivusizawijavoj.weebly.com/uploads/1/3/4/4/134482483/204e98a4ef.pdfIn PDF document text
    • https://taxonegumogel.weebly.com/uploads/1/3/5/3/135330056/9216548.pdfIn PDF document text
    • https://tudasuli.weebly.com/uploads/1/3/4/4/134403402/74df819e7cdfdf.pdfIn PDF document text
    • https://vuwodasoruza.weebly.com/uploads/1/3/4/4/134436366/6104150.pdfIn PDF document text
    • https://tawigijonepoter.weebly.com/uploads/1/3/4/0/134012415/b2716afccde.pdfIn PDF document text
    • https://turazuxutanuv.weebly.com/uploads/1/3/1/6/131606798/jesegixunumuga.pdfIn PDF document text
    • https://fofevupug.weebly.com/uploads/1/3/4/4/134490210/8154572.pdfIn PDF document text
    • https://xedatuvigino.weebly.com/uploads/1/3/4/5/134580066/e84aab76718fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419412/normal_6042f04422b4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393485/normal_6068f137e60a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459794/normal_601b3fde4c495.pdfIn PDF document text
    • https://jatazuleb.weebly.com/uploads/1/3/4/6/134662889/lolalam.pdfIn PDF document text
    • https://tagaxaxe.weebly.com/uploads/1/3/5/3/135390661/polibisinunetu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460688/normal_5fe13225345ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424682/normal_5fc92cce55811.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a66376-fd3f-43b1-a004-42430a60a777/el_arte_de_amar_pelicula_completa_en_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcc78569-f310-448d-8701-8fa41678731d/22593057781.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd1dfc30-3745-4de2-b0dc-9b1252cb044f/m_audio_oxygen_25_blue_driver.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c425fdf-2f52-4c51-8fc5-54d335b33291/dell_venue_8_pro_5855_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bdf0e55-97ee-4881-b348-a8195e43a00f/classification_of_matter_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc16a26a-36c5-4b48-8507-4d736e9bf05d/68284420800.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1b54d50-2708-447a-96f1-b61841035e32/83510906438.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_off0000f198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF198 5268 bytes
SHA-256: 671c86a25f85803ddec0d9a4e91069a20690f9bdb47fdb55e80f65f36abd7ccd
font_01_sfnt_off0001039f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039F 11024 bytes
SHA-256: 57d7e04403b7ca692e296767ba54b70e47e7d7b2a570df2e8a502a74d58dba2c