Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e96cabc76f06f85…

MALICIOUS

PDF

75.3 KB Created: 2021-03-19 16:14:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4475474178130c34c307ca9f53c72d64 SHA-1: 890b3300417cfe20f7f8a4d10757428b18c7806c SHA-256: 0e96cabc76f06f856bb1b94894d5daa6b5c7e26c7eacf7b784e0444e50ae152b
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a link farm with numerous external PDF links, suggesting a phishing or SEO poisoning tactic to distribute unwanted software or lead users to malicious sites. The primary URL, https://golowaki.ru/strik?utm_term=download+adobe+premiere+pro+2020+windows+7, further reinforces the lure of downloading software.

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://golowaki.ru/strik?utm_term=download+adobe+premiere+pro+2020+windows+7 PDF link annotation
    • http://mujusudi.iblogger.org/saxawafikesip.pdfIn PDF document text
    • https://fenemonefozu.weebly.com/uploads/1/3/0/7/130739495/9770036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384143/normal_6044700f82d22.pdfIn PDF document text
    • https://webexozaputer.weebly.com/uploads/1/3/2/6/132681415/fuzuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_601e035c43492.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490266/normal_5fefeaf6989aa.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/c976cf37-4d2e-4195-8b2b-9fea7aeea73e/65203041657.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/child_of_god_lyrics_and_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/how_to_print_in_black_and_white_only_epson_stylus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53184c13-4950-4aff-b98b-0adfff4e6212/18037625535.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/brushes_for_photoshop_cs5_new_collection.pdfIn PDF document text
    • https://3b0fe5ff-7f86-489c-8138-fc984e51136c.filesusr.com/ugd/bfd78a_6c03a2ea8d5d4e9293b49ffe36121188.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2a0d2a-1312-4946-819c-9ce752311f9c/rafael_lapesa_historia_de_la_lengua_espaola_resumen.pdfIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_3374bd16911c48888283d9c75b34510d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/026442c7-47dc-4279-8246-7d9c90e40333/vikozetuzubof.pdfIn PDF document text
    • http://kukuvil.epizy.com/vosesaxasunirubowikupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cd32678-52b2-4d30-a2d9-48f2441da8f5/88896030851.pdfIn 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_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 5692 bytes
SHA-256: f1aebf72334e8a6d522aa8172f1341e810f535611a971398c82370780635cc3b
font_01_sfnt_off000100fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100FB 11584 bytes
SHA-256: 0f6e38423496c51e7b3c74e0dca81d0d09810caae7f084edb07fb031783bae3a

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