Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9a5f70bae8cc12f…

MALICIOUS

PDF

77.4 KB Created: 2021-02-12 19:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 37691283d345cd24551364f4a0e8cf38 SHA-1: 25405a3f34e178d527635a9ebb33a1af52b298c2 SHA-256: b9a5f70bae8cc12f41c53dca8ae236a66e0f7529f1d112f651705596eba09402
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. The document body, though heavily obfuscated, contains references to 'Skype apk download for android 5.1' and an external URI pointing to a URL that also mentions 'skype apk download'. This suggests a phishing attempt to trick users into downloading potentially malicious software disguised as a Skype application.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=skype+apk+download+for+android+5.1 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4425209/normal_5fee98d660e66.pdfIn PDF document text
    • http://herss.space/552812518632ay2j.pdfIn PDF document text
    • http://zathkatow.xyz/digamozaruxoxadegurekowvm8tx.pdfIn PDF document text
    • http://olipaka.xyz/3d_animated_chess_games_freeljfkx.pdfIn PDF document text
    • http://hangzhoumetal.ru/bigo_live_apk_pcq1wsb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_601e6c970e689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454045/normal_5fd2f94c6186b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450427/normal_5fe7ee6d0a4f3.pdfIn PDF document text
    • http://moneyindia.site/how_to_download_sky_factory_1s0ha1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457582/normal_5fffdeca7d194.pdfIn PDF document text
    • http://constructionhouse.info/roku_se_streaming_media_player_setupfgzxe.pdfIn PDF document text
    • http://cashbackk.site/preparation_of_alkyl_halides_from_alcoholsvbujs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tiguvazigavis.epizy.com/b._form_course_details_in_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/wimagesogonel.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/86876795493.pdfIn PDF document text
    • https://s3.amazonaws.com/senodiw/29626391065.pdfIn PDF document text
    • https://s3.amazonaws.com/ravuxudibure/wemovitifepixejufudilora.pdfIn PDF document text
    • https://s3.amazonaws.com/wenobagupexekap/78103492449.pdfIn PDF document text
    • http://bajebozirodiv.epizy.com/chevaliers_de_sangreal_sheet_music_violin.pdfIn PDF document text
    • https://s3.amazonaws.com/wujodibu/first_amended_complaint_form.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/brts_full_form_in_surat.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_off0000f32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32C 5428 bytes
SHA-256: cdd4e302763d53e9a0cf504966657aeb47dc0b95610225e08679e09de47b52e0
font_01_sfnt_off000105dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 10056 bytes
SHA-256: e8457f980cfdc7d474b022c6f0d9ec7f653e0c7efc80f46a26e2f2a2288ac91d

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