Malicious PDF — malware analysis report

Static analysis result for SHA-256 421cfbf0948a31bc…

MALICIOUS

PDF

73.3 KB Created: 2020-12-27 08:37:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d48262e2a069a5e258999954cb114e90 SHA-1: b34972847b7308e9560ff3cda4d6c08dde07e23e SHA-256: 421cfbf0948a31bcd8b7acb86684bb233418edcabbf6b0061cadb92c85f33470
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a large link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs suggests an attempt to redirect the user to potentially harmful content.

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://trafftec.ru/aws?utm_term=ldap+injection+hackerone+report PDF link annotation
    • https://marizezibafive.weebly.com/uploads/1/3/4/8/134865590/davuf.pdfIn PDF document text
    • https://dumexegutotopu.weebly.com/uploads/1/3/4/3/134354144/2595470.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/jhb6nWQ/togunonuxosazoroku.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/VxgceJP/truck_driver_crazy_road_2_online_game.pdfIn PDF document text
    • https://cdn.sqhk.co/jozojijejip/zjjn3ic/cheetah_top_speed_km_h.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/hwiehc4/red_alert_3_soviet_march_sheet_music.pdfIn PDF document text
    • https://cdn.sqhk.co/femuzetoj/jbBhfic/48593458140.pdfIn PDF document text
    • https://wovegusokab.weebly.com/uploads/1/3/4/8/134850220/teroboxunabodafumuso.pdfIn PDF document text
    • https://resowijex.weebly.com/uploads/1/3/4/6/134681832/lorunapukogojo.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/mozirolinitaje/18101508337.pdfIn PDF document text
    • https://s3.amazonaws.com/tanikanaw/tesive.pdfIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/intermediate_cuneiform_bone_function.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/gasot.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_off0000d339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD339 4820 bytes
SHA-256: f7b734bc340387fa8236577d10ef752bd94364165300986f079b71df50956438
font_01_sfnt_off0000e38a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38A 12172 bytes
SHA-256: a78d40f2ff58f5e89f4c83ded3a5e92010bbac3042f1ffcd65998969d1c3a4f5
font_02_sfnt_off00010a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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