Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a1ae8ee520ef69…

MALICIOUS

PDF

83.8 KB Created: 2021-04-07 10:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9094288ee7b6a6f6fdd6cdff4228d3dc SHA-1: b9e3383e5eb8dfc80f2681f61c02bbd29b7bb4f8 SHA-256: 21a1ae8ee520ef69127290aed14bda82ed8f1d8babf570176cd0c4be52696513
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many of which point to known malicious redirectors and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=sample+letter+of+recommendation+for+assistant+principal+applicant In PDF document text
    • http://tesekal.mygamesonline.org/cpld_architecture.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/d00iF4B/carriage_bolt_washer.pdfIn PDF document text
    • http://botefedej.sportsontheweb.net/mofemufe.pdfIn PDF document text
    • https://cdn.sqhk.co/rigalazo/fdvc8he/tefamaripomaberatigo.pdfIn PDF document text
    • http://ribavid.medianewsonline.com/ariston_washing_machine_ar6l85_manual.pdfIn PDF document text
    • http://garant-ritual.online/best_ar_15_assembly_lubekf4om.pdfIn PDF document text
    • https://cdn.sqhk.co/sanevujaguda/wig3jjU/alpha_industries_m-_65_defender_field_coat.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • http://ccckkkkk.space/solo_exhibition_proposal_example65gos.pdfIn PDF document text
    • http://naturfresh.space/popular_ringtones_2019_download_mp3_tamiltw04a.pdfIn PDF document text
    • https://cdn.sqhk.co/rerunagakiz/6ieLhiB/28575818568.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/tazibabebamep/43248678796.pdfIn PDF document text
    • https://c9b0c9dc-51ad-46ec-84b2-dbc26df53712.filesusr.com/ugd/b6f588_1a9dc7b8109a449cb9dad65d442aafac.pdf?index=trueIn PDF document text
    • http://vekamodadon.onlinewebshop.net/longman_dictionary_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/mosutevovinalevirelivajok.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/cheap_vinyl_sheet_flooring_melbourne.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/worevuboxifagi.pdfIn PDF document text
    • https://s3.amazonaws.com/gagagakigibapo/42889410992.pdfIn PDF document text
    • https://ed7c5604-ec0f-4ae6-9d22-6d534b57d154.filesusr.com/ugd/1d5a3f_a448526a978c4ca38233d5e1252e19d4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lebejos/79535125992.pdfIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_aa710f27babe4b2c9eaff0f13a9b9f07.pdf?index=trueIn PDF document text
    • http://sewujajapivix.onlinewebshop.net/microsoft_access_2020_tutorial_download.pdfIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/4255664404.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_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 5404 bytes
SHA-256: 09cafc3b2307798aba5e6f1b6b0bf31579803446b419d04ffce291fbed2b335b
font_01_sfnt_off00011a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2F 10904 bytes
SHA-256: c2c29cb085fe9f971aede7b0ba8d4ad813916502a34d1eb2cd72e8c42168fd8f

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