Malicious PDF — malware analysis report

Static analysis result for SHA-256 633d8fccac6a3b89…

MALICIOUS

PDF

75.0 KB Created: 2021-04-14 17:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 19f4de2bdd6ee49f35161a147505e314 SHA-1: 05717bc6a437dad1d50297498779f03c12f0f107 SHA-256: 633d8fccac6a3b896d5bcc08fdde76f36483b4408c37c3b71fc4aa370b3866f1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to 'Beginner spanish verb conjugation practice worksheets', likely a lure. The presence of external URIs and the ML classifier's high confidence score indicate malicious intent, likely to direct users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://gimoguvi.ru/strik?utm_term=beginner+spanish+verb+conjugation+practice+worksheets PDF link annotation
    • http://daxamel.mywebcommunity.org/82414276935.pdfIn PDF document text
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/5154965.pdfIn PDF document text
    • https://gumevuwogixuxuj.weebly.com/uploads/1/3/5/3/135317748/sudalexikut.pdfIn PDF document text
    • https://sifobidegi.weebly.com/uploads/1/3/0/8/130874382/8a28cbe.pdfIn PDF document text
    • https://rugufixib.weebly.com/uploads/1/3/4/3/134381394/7911942.pdfIn PDF document text
    • https://xujeloza.weebly.com/uploads/1/3/4/0/134096435/pusisutofasilukogiw.pdfIn PDF document text
    • https://rilubaka.weebly.com/uploads/1/3/5/3/135303332/7189464.pdfIn PDF document text
    • https://tigewatujuw.weebly.com/uploads/1/3/0/7/130738543/1505391.pdfIn PDF document text
    • http://jisetatiloro.scienceontheweb.net/60435962967.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://70fbc5f3-53e4-4072-9ff7-a5862d19847b.filesusr.com/ugd/bb3bf9_29b7c83307ac4a2a8f60c4fea92778bb.pdf?index=trueIn PDF document text
    • https://ac263381-fdad-4fda-ae78-6df6d71032d6.filesusr.com/ugd/25c42e_7262224525d94c948ee36064c427d593.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixuzo/trait_d_aix_la_chapelle_texte.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/how_to_prepare_statement_of_comprehensive_income_from_trial_balance.pdfIn PDF document text
    • https://s3.amazonaws.com/wetowuzuxit/bass_songs_naa_songs.pdfIn PDF document text
    • https://83f018a0-8e49-44f0-b57e-805e464a5f06.filesusr.com/ugd/10a4aa_5551207cadb3430b95b40776c2234bf1.pdf?index=trueIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_38777fb4e3cf42e1999cd947fd624ff2.pdf?index=trueIn PDF document text
    • https://ac4cd5cf-e861-4b1b-a585-e47049f737a6.filesusr.com/ugd/843280_d3ca6d78606b4d32b1efb8c35c25acb9.pdf?index=trueIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_01581f6cd8a84d07944cd4620e779226.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_34f61c0831e842fe8b6e74ac9cc68310.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutisigila/zudijotuwaze.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_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 5644 bytes
SHA-256: 80267e527eca269d0dfd4c5a98659ca1356c264b0f3c8d52948ec4f046089de1
font_01_sfnt_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 11504 bytes
SHA-256: 97994aa17584966c363fa11f1a1fc144cb014857e914275420158c3641d01ba1

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