Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfe14294dbf4647…

MALICIOUS

PDF

75.9 KB Created: 2021-04-06 03:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2cb9cbf4333ee4962beaca898b482ad3 SHA-1: 2adac538a44044b59f7bd93643ed45357afd21bb SHA-256: 4bfe14294dbf4647e31226ca3743b71f93c1df5219a844cb18bdf6e5e02194cd
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9995

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 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://midufefew.ru/award?keyword=best+pdf+annotator+android PDF link annotation
    • https://nudikiwo.weebly.com/uploads/1/3/4/0/134042489/8045915.pdfIn PDF document text
    • https://nopolojeg.weebly.com/uploads/1/3/5/3/135349815/disasorikemu_desufa_zubutadizejid_depaxiz.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/wakojovapoxarunebu.pdfIn PDF document text
    • https://sufixekanol.weebly.com/uploads/1/3/4/7/134712322/jobiru.pdfIn PDF document text
    • https://zabojipenow.weebly.com/uploads/1/3/1/6/131636987/3665532.pdfIn PDF document text
    • https://bobilemako.weebly.com/uploads/1/3/4/7/134733435/277d3faa1d.pdfIn PDF document text
    • https://jorevubo.weebly.com/uploads/1/3/4/8/134869484/minamibefugipekud.pdfIn PDF document text
    • https://gokejubekilebu.weebly.com/uploads/1/3/4/3/134376129/lowidolitux.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/nakuzafol/how_to_study_public_life_jan_gehl_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/zuxivuza.pdfIn PDF document text
    • https://s3.amazonaws.com/vuterijoze/dell_p2419h_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/mijimu.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/sumawavanebaful.pdfIn PDF document text
    • https://s3.amazonaws.com/suzujewa/81615446740.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/bapakijetipasojo.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/valox.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/perimeter_worksheets_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/76109501815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0aa8c230-48fb-4785-88d4-49d6368fc8e8/rusozoxowi.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/70608419587.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/how_to_fix_sd_error_on_whirlpool_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb6b350f-1d83-4621-86b6-83dd7a6431cb/present_past_and_future_tense_worksheets_grade_6.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_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 5052 bytes
SHA-256: b17edadabc2dd83fbe0764bbab799dcab2c7921c356b7cb932246e9f2d6c47f4
font_01_sfnt_off0000fcc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC6 10988 bytes
SHA-256: 57e2608ee18ead12e1fecdd871293e107e53f280ab3d7c7997e3dbddf08aafc4

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