Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c371e24627aeca1…

MALICIOUS

PDF

78.2 KB Created: 2021-03-03 06:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 055cddb0fc915635ca6e8e23045c5623 SHA-1: 822bec3e9f4979642c463a94170c5f4cdddfe970 SHA-256: 4c371e24627aeca15c009b5a68b1a49c1c99a183fa8fc2d8f843656c04c0688b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a tactic to manipulate search engine results or redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

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://gimoguvi.ru/wb?keyword=which%20is%20better%20tools%20of%20titans%20or%20tribe%20of%20mentors PDF link annotation
    • https://bumokodujexub.weebly.com/uploads/1/3/4/5/134595190/8803312.pdfIn PDF document text
    • http://fumatiw.mypressonline.com/10881761296.pdfIn PDF document text
    • https://rezusoroporinon.weebly.com/uploads/1/3/2/6/132695427/15b9a02c.pdfIn PDF document text
    • http://nashremont.site/how_to_light_pilot_light_on_water_heater_with_igniterliybe.pdfIn PDF document text
    • https://xefigokilevugez.weebly.com/uploads/1/3/5/2/135299251/wefazamatuku.pdfIn PDF document text
    • https://logesili.weebly.com/uploads/1/3/5/3/135389335/8610bbc4f67e957.pdfIn PDF document text
    • https://musokuvezuref.weebly.com/uploads/1/3/1/8/131871850/e5adfe.pdfIn PDF document text
    • https://radisowe.weebly.com/uploads/1/3/4/3/134366404/ratorozamuw-nezijula-vupimakazefa.pdfIn PDF document text
    • https://tumozoredupoki.weebly.com/uploads/1/3/0/9/130969837/5839410.pdfIn PDF document text
    • https://jalebipozufi.weebly.com/uploads/1/3/5/3/135320073/kokumevox.pdfIn PDF document text
    • http://pesale.pro/51698864716c4k5h.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/pazatuv/ios_11_notification_bar_for_android.pdfIn PDF document text
    • http://fowimifefezujo.myartsonline.com/bobekeba.pdfIn PDF document text
    • https://s3.amazonaws.com/sorapobuk/13371726177.pdfIn PDF document text
    • https://s3.amazonaws.com/lomiwexuva/betiramujunama.pdfIn PDF document text
    • http://timojodabemisux.myartsonline.com/jujabesurado.pdfIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/pupoj.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_off0000f4bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BD 5272 bytes
SHA-256: 486a94121e5de17a363ab07f30c81965ada1b2fbf44f517009dfa35b751b0096
font_01_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 10668 bytes
SHA-256: dac30a532f885b07b2983c1da22ae985a61d169c387c565088b532e5f06bc228

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