Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77f726d6504f696…

MALICIOUS

PDF

75.2 KB Created: 2021-02-19 08:12:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: db919d9041e408600c1ea0eadc1c7fb1 SHA-1: e274a2f4e86e34ac6024007d036ef6b83b77c9b9 SHA-256: c77f726d6504f696ee2f9781b644b0b9474fcb6bb076e763e924c3b9b4c039ff
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL, identified as a high-risk indicator. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text that appears to be a lure, asking 'What is the hardest language to learn in the world?', which is likely intended to entice users to click the embedded malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/aws?utm_term=qual+%25C3%25A9+a+l%25C3%25ADngua+mais+dif%25C3%25ADcil+de+aprender+no+mundo PDF link annotation
    • http://yourlivehelp.com/cpt_cognitive_processing_therapy_worr53at.pdfIn PDF document text
    • http://erkutungotu.com/affidavit_of_guardianship_for_dost_scholarshippjj2j.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468534/normal_60018d0777abf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448724/normal_5fcf829bb7445.pdfIn PDF document text
    • https://cdn.sqhk.co/sadopore/YOjiicr/craftsman_plastic_tool_box_lowes.pdfIn PDF document text
    • http://agentsoft.space/gw2_super_adventure_box_world_2_zone_11mj9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407070/normal_6001fe7e42684.pdfIn PDF document text
    • http://gnfcns.info/69331152268jstz5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425501/normal_601021f869712.pdfIn PDF document text
    • http://good-production9.site/butterflies_png_imagesybe0h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/31489416443.pdfIn PDF document text
    • https://s3.amazonaws.com/wudibirewuduto/master_thesis_ppt_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/78412574537.pdfIn PDF document text
    • https://s3.amazonaws.com/vebenok/simple_blogspot_template_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/93556207376.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/89733245336.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/79390283318.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d60a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD60A 5536 bytes
SHA-256: b49a770b7d6876b2e911a11b0f1e77f9b19bc1f31d04b3330f106da8cc8b00ee
font_01_sfnt_off0000e875.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE875 12648 bytes
SHA-256: f3048af78555d029754947513d12c046fdff51694c864398ef9ea40f89d693a5
font_02_sfnt_off00010ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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