Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9af8b5bf300ea6…

MALICIOUS

PDF

82.5 KB Created: 2021-03-25 04:24:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a741ad1a67a674a2d478dca79e1a9479 SHA-1: 260bdcaa7cef89c15509bc39122570d30f6d82c9 SHA-256: ec9af8b5bf300ea699cd825101114eb4db5bf3c6234bc3229c12c2332bee0abe
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, characteristic of a link farm. The PDF document itself contains obfuscated text and embedded URLs, suggesting an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the presence of numerous external links points towards a phishing or SEO manipulation attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://bologen.ru/strik?utm_term=is+the+army+corps+of+engineers+a+good+place+to+work PDF link annotation
    • http://blancop.xyz/bateria_litio_18650_datasheet3nzlj.pdfIn PDF document text
    • http://legendbilisim.com/william_faulkner_absalom_absalom_summaryuytky.pdfIn PDF document text
    • http://mini-cam-v2.club/year_3_numeracy_worksheets_free74dda.pdfIn PDF document text
    • http://kurs1.xyz/how_much_is_a_wii_u_at_walmartbp98w.pdfIn PDF document text
    • http://bekowakiged.iblogger.org/tizijomu.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/rizijubovapuk/kuxipoxofasipevitenapug.pdfIn PDF document text
    • http://lubasabutatubo.rf.gd/english_speaking_practice_online_test.pdfIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/unconfirmed_reports_suggested.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/zifejupesube.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/aged_care_guidelines_nsw.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/bailar_conjugation_formal_command.pdfIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/nalituvufomumowulep.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_f2cd8a2d6c2845ff88a101d12fca1a0d.pdf?index=trueIn PDF document text
    • http://xapuzafuzokuw.rf.gd/fisika_medan_listrik.pdfIn PDF document text
    • http://gedamodeges.epizy.com/85923314636.pdfIn PDF document text
    • http://momesesewoja.rf.gd/singapore_math_earlybird_kindergarten_reviews.pdfIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_d4a1a87447b0459ead0ab67ff420a61b.pdf?index=trueIn PDF document text
    • http://bijokosi.rf.gd/how_to_use_8_qt_insignia_pressure_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/29021685817.pdfIn PDF document text
    • http://visititeralu.epizy.com/john_deere_x320_bagger_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/21635255020.pdfIn PDF document text
    • https://bf5f3f24-cfb9-4aec-9f01-83e6d863dc5b.filesusr.com/ugd/1f4526_a90bf215a3464e468d815dce9b84b487.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/xufapek.pdfIn PDF document text
    • http://xavitubipuru.rf.gd/karnataka_budget_2020_19_in_kannada.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_off00010408.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10408 5764 bytes
SHA-256: a11b0c7caa139e77f4e2ee520cc05870ebab499b5b3c27f7ffe8ca0991a583b1
font_01_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 10684 bytes
SHA-256: 9c1235a089c2e268fd504be5318cd7bd3ca049f7abd86f658f5960806728486b

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