Malicious PDF — malware analysis report

Static analysis result for SHA-256 583f7f456a283cb7…

MALICIOUS

PDF

74.5 KB Created: 2021-02-21 14:54:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 4738abef4940789e8c488cc166e6855e SHA-1: 08171a8cdf57191437daece81c715d7390c16181 SHA-256: 583f7f456a283cb72d94a9b9ef464591a016d18f29926b5d57979bfa7adc6b86
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or directing users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jacksth.ru/strik?utm_term=queer+phenomenology+orientations+objects+others+pdf PDF link annotation
    • https://jukafubu.weebly.com/uploads/1/3/0/8/130874261/mosekid.pdfIn PDF document text
    • https://xinomufe.weebly.com/uploads/1/3/4/7/134706409/4263159.pdfIn PDF document text
    • http://sehq.xyz/412363446677djgz.pdfIn PDF document text
    • https://xazupegenam.weebly.com/uploads/1/3/2/6/132695472/rimiwusopufer.pdfIn PDF document text
    • http://idealica-italiaufficiale.site/5599375544821ytj.pdfIn PDF document text
    • https://zabaparadasikid.weebly.com/uploads/1/3/4/3/134317604/b0803500d86f.pdfIn PDF document text
    • https://nibiromevisike.weebly.com/uploads/1/3/5/2/135299411/8c3ce42.pdfIn PDF document text
    • http://pesale.pro/51698864716c4k5h.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/7195103.pdfIn PDF document text
    • https://mebotorafegamor.weebly.com/uploads/1/3/0/7/130739377/kejifi.pdfIn PDF document text
    • https://kopaluzakiletal.weebly.com/uploads/1/3/0/7/130739322/nizesobutaguwo.pdfIn PDF document text
    • http://monoga.space/68481279339ztpij.pdfIn PDF document text
    • http://pc-remont.website/new_naats_2019_audiox0uso.pdfIn PDF document text
    • https://bawilawuvibowe.weebly.com/uploads/1/3/4/4/134401702/guziz.pdfIn PDF document text
    • https://fozaxuvuten.weebly.com/uploads/1/3/3/9/133986835/1800330.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/rezugekolaba/eyeball_anatomy_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xakajoziwibi/challenging_negative_automatic_thoughts_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/51848367603.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/xuvuvub.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/anthem_blue_cross_california_medical_claim_form.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/58429437318.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/66204341372.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/72562216301.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_off0000e4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D0 5948 bytes
SHA-256: ef05106b60445f4283570ec46feacc260aa4e4462ec1bab78319ea02521475db
font_01_sfnt_off0000f8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E9 10280 bytes
SHA-256: 525e1d8c39db3a6101aa7d8e22f9545aa3ef6026225ee81e6a68f4ed0aa3a624

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