Malicious PDF — malware analysis report

Static analysis result for SHA-256 e660121a76e6a3d1…

MALICIOUS

PDF

72.1 KB Created: 2021-02-14 15:34:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7c7da5c56350598b70d60ba06993e4c4 SHA-1: a11f8a46e849e60344f47712c237fa6dc5a3976f SHA-256: e660121a76e6a3d1ddd8389a691e79c8ba8a2e50762ac5e8e5feab8af0dac1a6
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 of which are to PDF files, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the presence of numerous external URLs and the PDF structure itself are indicative of a phishing or redirection attack, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=how+to+find+slime+in+minecraft PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366984/normal_5fecf46787732.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497095/normal_5ff459d497233.pdfIn PDF document text
    • https://rosolivemimej.weebly.com/uploads/1/3/1/3/131382018/zefonixogel_lejelux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_600f30f9efdba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496586/normal_600dfd8fdafb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_5fde06c44bd30.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5ff54f279a809.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/duduperufaj.pdfIn PDF document text
    • https://vejilete.weebly.com/uploads/1/3/5/3/135312445/45d6569.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410976/normal_600b1bfce5bf4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://komadolosa.rf.gd/utah_motor_vehicle_bill_of_sale_form.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/vuzodajojib.pdfIn PDF document text
    • http://sisuraregimu.rf.gd/how_to_use_love_alarm_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xajowu/92450507979.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_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 5220 bytes
SHA-256: 8efe5360c3aceaf8c5657efbdcb10af0b7f0498be0be0cd8e1de48a5561ad619
font_01_sfnt_off0000ef00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF00 10748 bytes
SHA-256: 661b296ac872fa2252c3b60170acc634f96a552499eb911bc26076e6f939e62f

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