Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfcb74a8f1c6a459…

MALICIOUS

PDF

219.7 KB Created: 2021-03-24 04:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ae853c180ad2f35aa54d2293ca025c05 SHA-1: 26149439cfc7814400d903b6645fc3f569eb2725 SHA-256: bfcb74a8f1c6a459449b4697e1ae19fcd4ab6ad9558de1e093252816d73630cd
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, 'jottigo.ru', which is likely part of a phishing or malware distribution scheme. The document body, though heavily obfuscated, includes metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URLs indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=immanuel+kant+beliefs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374699/normal_6054df0eee4c1.pdfIn PDF document text
    • http://pekibimige.mygamesonline.org/depressive_disorders_dsm_5.pdfIn PDF document text
    • http://jixazepo.mywebcommunity.org/calendario_2020_festivos_colombia.pdfIn PDF document text
    • https://cdn.sqhk.co/jasorevujoxu/9fjiarj/button_button_short_story_questions_answers.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/76006833637.pdfIn PDF document text
    • http://sebevifa.getenjoyment.net/adjective_worksheet_grade_7.pdfIn PDF document text
    • http://nawavidosuk.medianewsonline.com/arnold_sonatina_clarinete.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_603a058a9842e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449629/normal_6032ab71d60c5.pdfIn PDF document text
    • https://cdn.sqhk.co/waxulimelu/bjhOgig/juvozilibanisonamew.pdfIn PDF document text
    • http://rajajime.mypressonline.com/what_does_it_mean_when_your_smoke_detector_blinks_red.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_a6cc8b8e7ae1433ab7512d9b2f72dea3.pdf?index=trueIn PDF document text
    • https://3d7304b5-8527-495f-b913-615d6f357a43.filesusr.com/ugd/ef7486_ec1b3b6b943f4e4291a6ece66db8cc28.pdf?index=trueIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_c2bfde688d0c40769657e91d878039a5.pdf?index=trueIn PDF document text
    • https://c1e70603-6ca1-47bc-880b-b60d7d434995.filesusr.com/ugd/df625d_5c277edf79d74d32b888628e5df66eaf.pdf?index=trueIn PDF document text
    • https://492f55f4-3442-4b37-b17e-39d9f2f0ae8a.filesusr.com/ugd/7dfe85_0624fd27659f42d7ba7f936f3693f6cd.pdf?index=trueIn PDF document text
    • https://e9b66cc5-9289-431c-8f17-6739e1cd2d88.filesusr.com/ugd/c8f33b_dcbefa641ac443adbfbe3a60fe01bae1.pdf?index=trueIn PDF document text
    • https://0502d5d0-a0f5-47b8-bc1c-644c46e4e431.filesusr.com/ugd/6cabbb_54c193cde354444c9b0f3090dbe4540e.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00030be6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30BE6 4956 bytes
SHA-256: c234aaf5be9e0544d2c53ae2bc0e1b5ced23180c888878ff59f5da7666d8c2f2
font_01_sfnt_off00031cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31CB3 16252 bytes
SHA-256: 46693f2f59d9247b3532296c158145ee7ef2b71d0e67569676c47950fcb4b3ee
font_02_sfnt_off00034c46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34C46 16060 bytes
SHA-256: 99ddc6f5858eb134f8024171ebe717cbd02485c31471b921a5021903b5272953

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