Malicious PDF — malware analysis report

Static analysis result for SHA-256 df12019eff58fa18…

MALICIOUS

PDF

73.5 KB Created: 2021-06-03 10:48:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e4724247aa37716b15e4df558624b724 SHA-1: 8c59e49fbe2568184e42b7ef8a763d138d1a87dc SHA-256: df12019eff58fa188d5208c7bb16b2b1895fca041bcac3ba4e9c5a6a6df336f1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nomylo.ru/pbw?utm_term=can+i+unlock+a+phone+from+a+carrier PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410416/normal_601efc6c4ce23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377905/normal_605f6fa6841cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495988/normal_601dbc6084651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476418/normal_5feaed65391ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_5fd79a907d22c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_605a777ab287f.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/053416bc-e057-46be-80c3-b0fdf9459df2/arunachalam_full_movie_download_in_tamilyogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9071222-e826-4f26-b93e-553636f28614/81175731781.pdfIn PDF document text
    • http://larabefejaji.pbworks.com/f/41001075871.pdfIn PDF document text
    • http://pamotekegopa.pbworks.com/f/how_long_does_ogilvie_home_perm_last.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d79dc2b9-753f-4367-a468-e1224d1cd12d/12835528530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7b19b5f-e073-4a63-a468-dcc15c6bf9c9/10788469355.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/f/5750678473.pdfIn PDF document text
    • http://fudejob.pbworks.com/f/subject_verb_agreement_worksheets_intermediate.pdfIn PDF document text
    • http://sonopewobu.pbworks.com/f/34364482664.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8c1af5-15f3-4231-819a-4617738c991a/guvofida.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/f/19916937416.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_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 5048 bytes
SHA-256: b9cb39dc34cc097aa16aa5a5f589d74c7960445ce60e2337566727366a2de9f4
font_01_sfnt_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 11140 bytes
SHA-256: e2a0b8d955b81668945ee418572339e026640acfeed862bf15a5a125ba0268cb

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