Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3d384d5a1c85ee…

MALICIOUS

PDF

70.5 KB Created: 2021-02-22 09:08:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4e3603d70cc30648adc13362ffbba6ee SHA-1: b0ae27e7224ed66f097b6cfe58e069ba27f00904 SHA-256: 3b3d384d5a1c85ee6916e5b86f7a50afb0f746a6b838df11d860b80212198018
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDF files, suggesting an SEO spam or link farm operation. One prominent URL, 'https://jottigo.ru/wix?keyword=war+horse+book+worksheets', is directly embedded and likely serves as the primary lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/wix?keyword=war+horse+book+worksheets PDF link annotation
    • https://wanuzixa.weebly.com/uploads/1/3/1/4/131482886/titedefi-susalodemo-zitumamonobase-zunawatopew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501980/normal_5fcb231a5a72a.pdfIn PDF document text
    • https://voloxamofe.weebly.com/uploads/1/3/0/8/130874475/6218716.pdfIn PDF document text
    • https://sevozinevuzejok.weebly.com/uploads/1/3/4/9/134903388/kukaj.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/jibameriz.pdfIn PDF document text
    • https://pamigewome.weebly.com/uploads/1/3/4/6/134631685/5282298.pdfIn PDF document text
    • https://xewulowew.weebly.com/uploads/1/3/4/7/134757629/ginobono.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/mejifavo/zebolotifuwiruxifo.pdfIn PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/4342175961.pdfIn PDF document text
    • https://s3.amazonaws.com/kudowo/28917965978.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/colbert_report_eleanor_holmes_norton.pdfIn PDF document text
    • https://s3.amazonaws.com/gavobawum/30375914476.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/revista_natura_ciclo_14a_2018_argentina.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/idle_miner_tycoon_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/bhajan_instrumental_ringtone_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/best_dictionary_app_android_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/daradofumo.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_off0000d92f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD92F 5048 bytes
SHA-256: 8b8b1c2eb8e925cd1eaaf9c44310f3ad3518212eb7c653a1b59712c29dd8093c
font_01_sfnt_off0000ea70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA70 10360 bytes
SHA-256: 1fde77973763d44284b5abb979d81b7c9003b906066787475e48065ff56e4b8e

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