Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c71c09ae7906891…

MALICIOUS

PDF

84.8 KB Created: 2021-04-10 00:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 00a9ffa299ad9f8bc7cb8f344cbd15a8 SHA-1: 9f2d925b5e902c8928f423d215282438c03188ba SHA-256: 2c71c09ae7906891412379c9a39806f9cfbfb3775005bb7cec8eca06d460379d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded text, though garbled, references "High school musical 2 ss script", likely a lure to direct users to malicious URLs such as `https://baarspo.ru/strik?utm_term=high+school+musical+2+ss+script`.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=high+school+musical+2+ss+script PDF link annotation
    • https://buvonage.weebly.com/uploads/1/3/0/9/130969236/4837708.pdfIn PDF document text
    • http://eglo.club/46139609886o6uck.pdfIn PDF document text
    • https://gutamunimidujad.weebly.com/uploads/1/3/4/6/134667749/8998902.pdfIn PDF document text
    • http://domen3.club/how_do_i_make_my_apple_watch_series_4_waterproofk3lvl.pdfIn PDF document text
    • https://noripuluse.weebly.com/uploads/1/3/5/9/135957130/5180891.pdfIn PDF document text
    • https://jifofavara.weebly.com/uploads/1/3/4/6/134631997/zebemirerutumelimezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_5fe8f514c524d.pdfIn PDF document text
    • https://penuwoguf.weebly.com/uploads/1/3/6/0/136056634/giburike.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483071/normal_6008ee8a2c7e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5ff9ad8447bfd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_600bfbf49182b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427780/normal_5fdc8cd72bbe8.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/ab6ece05-2e43-4d0a-9938-08a5d544697c/sony_mdr_rf985rk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c61957b4-f085-4b2d-a6c0-99de04011c2a/xuropelewavelimotadetot.pdfIn PDF document text
    • https://1c437d0a-cccb-4a8a-93f1-39e0b5126915.filesusr.com/ugd/b91566_8825904a9d164b0893285fb758cdbefe.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_86dd375ed15c4c00a278be122aeea6d0.pdf?index=trueIn PDF document text
    • https://3cd6846c-369c-4875-9c63-132df726a2dd.filesusr.com/ugd/7ab50f_11487166fa67432ba8121eb0c4bbf401.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c42b626-52b2-475d-b658-36647fee45d5/21925773387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b5d2d6-98f2-441b-b3ff-7de0d1f10cb4/49495319650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8dfd74-6732-46ac-b527-d6f8122df17d/39570605742.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_off00010d02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D02 5440 bytes
SHA-256: c56ea80f77bc30d848847c67eaf59f60218f015756b7124b4f07a3727bfc6912
font_01_sfnt_off00011f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F60 11184 bytes
SHA-256: a71fce3bf5ed915db792428d6d32bb6aace9015e9cf5873c2cfd0c81fad94c77