Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c6449d0a35184a…

MALICIOUS

PDF

76.6 KB Created: 2021-03-30 15:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f2c8b26e60c59acfa91a5099af99135c SHA-1: 9049b408f5048aceb19a2c8f570338b9985f63ed SHA-256: 18c6449d0a35184a27fe8b815c1d66d2d0dc5011db7b26e6ce8109722134b4a3
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to potentially malicious or spam-related content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/strik?utm_term=how+to+load+film+in+a+vivitar+camera PDF link annotation
    • http://electorat.org/nelson_grade_9_math_textbook_answersae89x.pdfIn PDF document text
    • https://magivuvesef.weebly.com/uploads/1/3/0/7/130775451/931de.pdfIn PDF document text
    • https://neruzokari.weebly.com/uploads/1/3/1/1/131164447/silimukimu_rosipebovaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368225/normal_60176ed9ab30d.pdfIn PDF document text
    • https://jogojirodatu.weebly.com/uploads/1/3/4/3/134321770/kesiguru-perixokobijoka-vasevekafag-rotovebumo.pdfIn PDF document text
    • http://muvirire.22web.org/25750183845.pdfIn PDF document text
    • https://fitepavi.weebly.com/uploads/1/3/4/4/134485464/nosel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497650/normal_603ccbc2c2eac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481663/normal_601b893260398.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474999/normal_600d79013c09c.pdfIn PDF document text
    • http://uscreditinquiry.info/nelemedouidg6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408995/normal_603b7ca1b6e35.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/79a02d4e-c944-4977-bb78-1bc58adf7d95/sat_math_practice_test_download.pdfIn PDF document text
    • https://2c5a832e-93c4-4ab0-bef0-969ef348d747.filesusr.com/ugd/cc5daa_ec6089e2e95f4a25a6448bea8ec23543.pdf?index=trueIn PDF document text
    • https://abf133a7-37c0-4616-b653-d99fd306bce3.filesusr.com/ugd/5c8236_d544913f991f41159a3e46dda305ac91.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a765d0f-671c-4f5f-94ad-556d184267c0/wiwezodituka.pdfIn PDF document text
    • http://julivaradisakit.rf.gd/love_story_piano_sheet_music_easy.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_4642225ae0fc455db4ffd9dbb55f36d9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b783a3d-702b-40ef-b0ba-512997fd168b/3148399542.pdfIn PDF document text
    • https://200c4c3d-185b-4246-b99f-f40cd7065c99.filesusr.com/ugd/3ed902_9018d86f5ee04314b6e791084ac72af8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec261a9a-2b5f-432b-baa8-2d4de60518b4/timothy_zahn_thrawn_books_in_order.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_6bca47fb0c9a41e4ab4a3496e511a104.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89c2cae3-4678-493a-9780-4c2fb7f4c23c/twilight_breaking_dawn_part_2_soundtrack_spotify.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_off0000edfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFA 5100 bytes
SHA-256: 56e9560a787bc3940d7577640731c7d9cdb8468f21b4d592a9d64a5298f32fef
font_01_sfnt_off0000ff59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF59 11096 bytes
SHA-256: c150f9da1b1d641c0ffc78a1c3d6c9be2016d3218da4e58c94abcdd935187d44