Malicious PDF — malware analysis report

Static analysis result for SHA-256 256ba165121a2614…

MALICIOUS

PDF

68.5 KB Created: 2021-04-24 11:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 048a78556f54808b05d474b8f65e8d21 SHA-1: 27a8d291d2d25bdcc87667b857d8d4f081f07c4d SHA-256: 256ba165121a261477a9f7beee3543d3e36156c1cb6eeecc10d91aaa8b499734
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to star luminosity, which is likely a lure to direct the user to the malicious URL. The presence of multiple external URIs and link farm heuristics further supports a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://kuzutuzo.ru/strik?utm_term=which+type+of+star+is+generally+most+luminous PDF link annotation
    • http://secret-empire.ru/7012004095446rgc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407576/normal_6050f8bfd1f94.pdfIn PDF document text
    • http://pumba-timon.space/70622808786pvfwx.pdfIn PDF document text
    • https://cdn.sqhk.co/vivakawibaki/gvaM2Da/61603232096.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445341/normal_603a78d778d7a.pdfIn PDF document text
    • https://cdn.sqhk.co/dakuwuwuzije/hag3gdM/tafolusoxe.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/hiiggdI/ball_holen_hund.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461250/normal_5fd82b6e2dccb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367916/normal_5fcd1b67ce76f.pdfIn PDF document text
    • https://cdn.sqhk.co/kezomerameki/iiicjcS/heart_app_iphone_5.pdfIn PDF document text
    • http://whowill.ru/wd_my_cloud_ex2_ultra_reviewabh8t.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fca3451-e381-4c19-b576-7207c9b615bd/xedewimep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d079c8-dd36-49b0-8fd2-7f286aa21ea7/what_is_a_shakespearean_sonnet_poem.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/mamojunut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0974de5-1a97-48dd-883c-39d7bb6550f1/how_long_is_a_feast_for_crows.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/bidaai_movie_mp4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f88816c1-991f-40be-912b-6afa9c76f703/olympus_om-1_battery_check.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b1e720-c429-4c56-bf37-949ed7f5f626/gogavisonunadifipimafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43deeaf4-e466-434b-ad0e-ab0a9f8105b2/xemekitepegoxodo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3750293b-7192-4601-b2b4-89b3ce9a6270/sidusirusafukedot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8edeeb0-3062-415b-bb38-1fa3e9e96f46/the_subtle_knife_replica.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/zosozerafes.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_off0000cef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEF4 5544 bytes
SHA-256: 879e6e31b44744b56a870262f001d599f32165fdf2ca0ba0aea1a9b232772840
font_01_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 9956 bytes
SHA-256: 9f75e4a58680ff73f681e1a16befc158cd1477830764c473615d5123598cf9b5

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