Malicious PDF — malware analysis report

Static analysis result for SHA-256 efe4e9555082085f…

MALICIOUS

PDF

70.3 KB Created: 2021-03-15 09:18:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e39fb8573db517a720bc5eb42519e2ab SHA-1: 248747bf4bf29a2a684cf50b0fc44f4bf4286f77 SHA-256: efe4e9555082085ffc409d54086dfb62628def428cb57d862a6f162cef1b8ebe
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to direct users to phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/wix?keyword=through+the+tunnel+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370302/normal_601ec0be8a883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410216/normal_6030e22ad7d6a.pdfIn PDF document text
    • https://pejivepomut.weebly.com/uploads/1/3/5/3/135339444/4531583.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/6344899.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482625/normal_5ff16f1367a09.pdfIn PDF document text
    • https://lobogisotu.weebly.com/uploads/1/3/4/8/134870795/4577580.pdfIn PDF document text
    • https://jemogofeti.weebly.com/uploads/1/3/4/0/134042608/2464483.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451368/normal_5fdf1fd1797ca.pdfIn PDF document text
    • https://luxaxezasu.weebly.com/uploads/1/3/1/3/131398230/tanod_mabebowokas_wixezedip_jipojiwite.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458633/normal_5fde9222bb399.pdfIn PDF document text
    • http://vulodazutinele.22web.org/how_to_unlock_speed_queen_washer_door.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/tuletivotarupu/game_of_thrones_sheet_music_trumpet.pdfIn PDF document text
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_b612c860c0ba42ba8e901c6e69ef74fa.pdf?index=trueIn PDF document text
    • http://sibijexobesu.epizy.com/21600450898.pdfIn PDF document text
    • http://jidibavozajo.epizy.com/54628955595.pdfIn PDF document text
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_9329a882c8f845d986bda59772c4888c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ditiruz/google_sheet_function_text.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_22c8ffe671144e5caf20b7a24499bf85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/futamo/original_elf_bowling_game_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/rotuguvawapolitowaweg.pdfIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_96410914e2d64d229e0c3df6d8b9a03e.pdf?index=trueIn PDF document text
    • https://0f939073-77d1-4307-aaa8-42539c8515e3.filesusr.com/ugd/85c9df_0a6ed217992b4126b0c951bfe44b34cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/50244751185.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC09 4692 bytes
SHA-256: 4433814d5222e34dc46d5541127e443f7034a8bdce9ab2f9ec44c72674439e28
font_01_sfnt_off0000dbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF7 9896 bytes
SHA-256: 53a3c54e1053c64bfe3893d0c1952523e946758f27a221cc576500f4db875bde
font_02_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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