Malicious PDF — malware analysis report

Static analysis result for SHA-256 2465135cb6f72c52…

MALICIOUS

PDF

77.1 KB Created: 2021-05-21 02:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f842f8cfbf62c60b5f8ebc35a77b771b SHA-1: 33515bf0861698b4fa314a2cdb2a7c8df2992392 SHA-256: 2465135cb6f72c524dd877ef6ad62422229947d9e057c0bd73cfa8bcc97e5eb5
192 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a malformed exploit stream and includes a link farm of external PDF links, suggesting a malicious intent to distribute further content. The presence of a download button lure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicate a phishing or malware distribution campaign. The embedded URLs, particularly the one related to movie downloads, serve as the primary lure for users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://midufefew.ru/strik?utm_term=despicable+me+1+tamil+dubbed+movie+download+isaimini PDF link annotation
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/4202142.pdfIn PDF document text
    • https://memezuwiz.weebly.com/uploads/1/3/4/7/134702577/3816860.pdfIn PDF document text
    • https://pekeweluxema.weebly.com/uploads/1/3/5/3/135304067/5484493.pdfIn PDF document text
    • https://dujemezore.weebly.com/uploads/1/3/1/3/131381607/risotebaveju_dovuzuv_lazexo_fupofure.pdfIn PDF document text
    • https://fazajamol.weebly.com/uploads/1/3/2/7/132740605/9d90ad7ed2cd.pdfIn PDF document text
    • https://nolalitikobuno.weebly.com/uploads/1/3/4/7/134768790/wodajikaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383918/normal_603e4266284f3.pdfIn PDF document text
    • https://luxufaxunixepu.weebly.com/uploads/1/3/4/5/134584211/jakabeboxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387938/normal_60045d65d1d3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406241/normal_600b55d54af29.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/4341275.pdfIn PDF document text
    • https://vusexojepaxeva.weebly.com/uploads/1/3/4/0/134096357/9107999.pdfIn PDF document text
    • https://nupigefaxobabu.weebly.com/uploads/1/3/1/0/131070289/tujegawaregiga.pdfIn PDF document text
    • https://ninusava.weebly.com/uploads/1/3/1/4/131436980/7229814.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/woneketelak/deziwezulodixoxira.pdfIn PDF document text
    • https://s3.amazonaws.com/zuniverijesud/jetipadawumarojereruwi.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/how_to_lose_weight_using_resistance_bands.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/a_level_chemistry_revision_notes_aqa.pdfIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/81056884957.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/active_admin_form.pdfIn PDF document text
    • https://s3.amazonaws.com/genukopapovixo/kefafeguli.pdfIn PDF document text
    • https://s3.amazonaws.com/wakuzidi/kitchenaid_electric_stove_top.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/wijawerinidalesewakidawo.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_off0000efdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDC 5464 bytes
SHA-256: b38eb20042007142c1832788cf9e4b01a9a1096abe54005ac15ae87e15231f15
font_01_sfnt_off0001027d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027D 10560 bytes
SHA-256: 97d7fcd3f135542e89b90c98e5c68c2f607e70a41e565682cd63eee588eb9cca