Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdae496b139ec93…

MALICIOUS

PDF

71.5 KB Created: 2021-03-02 23:18:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 49d7670590cea86e8da9999b30279cac SHA-1: aeeae2cad0963ef511cfe5f52d8dfe85154973fa SHA-256: 4cdae496b139ec935ed9b9988d91f9a028a22ba8ff8537f0c0982a1403f1774c
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or SEO poisoning tactic to direct users to malicious sites. The embedded URLs, such as 'https://dugedepap.ru/award?keyword=how+to+reboot+verifone+vx805', are likely part of this distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://dugedepap.ru/award?keyword=how+to+reboot+verifone+vx805 PDF link annotation
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/malexilaza-rejugusukuse.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5fef4700514ea.pdfIn PDF document text
    • https://gojojiwegojefuw.weebly.com/uploads/1/3/2/6/132695574/bijiki.pdfIn PDF document text
    • https://kesevaze.weebly.com/uploads/1/3/1/3/131383297/128137.pdfIn PDF document text
    • http://islemleriniz.org/are_ariston_appliances_any_goodkdd8w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416656/normal_5ff87d1533a0e.pdfIn PDF document text
    • https://wekubuzebebam.weebly.com/uploads/1/3/0/7/130739705/4858860.pdfIn PDF document text
    • https://zomanuvid.weebly.com/uploads/1/3/4/4/134477829/fexiwuwibatemeti.pdfIn PDF document text
    • https://tefegepivovopuf.weebly.com/uploads/1/3/5/3/135311357/02cd28f1.pdfIn PDF document text
    • http://lnstagram-helping.live/zudizoxefewogapibuvogj5jj4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_601db464d9c8a.pdfIn PDF document text
    • https://povewagefafede.weebly.com/uploads/1/3/4/8/134888055/finozovajupirov_jikepokake.pdfIn PDF document text
    • http://istra-backwater.ru/pulgadas_2_a_mm2sumvg.pdfIn PDF document text
    • http://sait-ok.ru/630639055490bpjr.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/zumezeviwakiz/bufunabi.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/best_sharing_app_between_ios_and_android.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/beiimaan_love_movie_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/ammonium_bisulfate_formation_in_scr.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/42607466088.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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 5120 bytes
SHA-256: b88edaa1fa689bd493d93dcbec8cc7bd9dc6b08812e68a6c040fa55e53b1a6e3
font_01_sfnt_off0000ec50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC50 10748 bytes
SHA-256: 5c0d1e38b7bcee2d40cdc568370bef9c7a953cf50ce383b1f5c83daab7f19aca

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