Malicious PDF — malware analysis report

Static analysis result for SHA-256 994ab734e3171d05…

MALICIOUS

PDF

74.0 KB Created: 2021-05-21 10:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c539c427c86b4267bda31051af3dcf29 SHA-1: db93033d5e06f270e21129bbd33b9c20c280c26d SHA-256: 994ab734e3171d05c24fa088509ff230177b92fda02c01e5e0c620d044fc01bc
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, with one primary URL pointing to a suspicious domain. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/strik?utm_term=fiddle+faddle+violin+sheet+music+free PDF link annotation
    • https://visunudit.weebly.com/uploads/1/3/1/4/131483005/nasogaparogem_buxipani_varizejomala_nujobolaxa.pdfIn PDF document text
    • https://vesukinixemijuw.weebly.com/uploads/1/3/2/6/132696016/6f9d1e4eee42321.pdfIn PDF document text
    • https://jijemelagif.weebly.com/uploads/1/3/4/0/134016961/2897874.pdfIn PDF document text
    • https://wudajelenap.weebly.com/uploads/1/3/4/4/134470879/1226006.pdfIn PDF document text
    • https://zuzilumapodebaj.weebly.com/uploads/1/3/1/3/131382406/1564154.pdfIn PDF document text
    • https://gokotaxoka.weebly.com/uploads/1/3/4/1/134109163/kosemawif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486535/normal_5fca70d6be9f5.pdfIn PDF document text
    • https://tatilimaju.weebly.com/uploads/1/3/4/4/134464449/zovijokuzaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413112/normal_601cb1c3a1af2.pdfIn PDF document text
    • https://kimetupuvojum.weebly.com/uploads/1/3/2/6/132680977/0f0030.pdfIn PDF document text
    • https://xuwosanilenerev.weebly.com/uploads/1/3/4/9/134900173/vinebo.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/xulepiwa/redacted_mystery_report_wizards_unite.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/servicio_de_alimentos_y_bebidas_en_un_hotel.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/rusosilomegogojipin.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwimadaneb/what_happens_when_you_share_a_video_on_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/internship_report_sample_for_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/fizaxo/ashes_of_oahu_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/37859013193.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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 5276 bytes
SHA-256: d382c133c1025f37885573022249384e4ecd27625b3170d907f657a18e57e784
font_01_sfnt_off0000f665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF665 10640 bytes
SHA-256: 2e1358a94ea37704b4d18348201c55ef34a1a588fd9271c9f74fc5adfcbcdc17

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