Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffbdf21202bf9e2…

MALICIOUS

PDF

89.4 KB Created: 2021-05-08 16:57:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 81eb8d0219a55277a4f9c25169fed00f SHA-1: 1c175a35eff5e918542c67dbbe4e9c9e55f74784 SHA-256: 7ffbdf21202bf9e2a7086752f020026612358439123b8af6772b80d5fef33c0d
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, indicating a phishing or trojan threat. It contains an embedded URI pointing to a suspicious domain, likely intended to host a malicious payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to 'Heart of darkness' to entice users to click the malicious link.

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://bologen.ru/strik?utm_term=heart+of+darkness+summary+litcharts PDF link annotation
    • http://rezonansmusic.com/98411774358n3mc5.pdfIn PDF document text
    • http://blockingscenery.com/arbeitsvertrag_download8aqm0.pdfIn PDF document text
    • http://helpcenterbusiness.xyz/pakeluxasovesuwiv2cd9.pdfIn PDF document text
    • http://nubolutlion.xyz/bevuxuge6riz2.pdfIn PDF document text
    • http://front-glass.space/sajutnlmdq.pdfIn PDF document text
    • http://mybiol.site/88015235120db7tf.pdfIn PDF document text
    • http://zilixijabukepul.iblogger.org/crossword_answer_for_bricklayers_cutting_tool.pdfIn PDF document text
    • http://mrt-64.ru/xuserep1lm1.pdfIn PDF document text
    • http://salonop.xyz/3801977067988yic.pdfIn PDF document text
    • http://interplast.ru/66408407668j529z.pdfIn PDF document text
    • http://dojurajopixu.iblogger.org/zixev.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/lerezazo/nivel_de_prevencin_primaria_en_los_trabajadores.pdfIn PDF document text
    • https://s3.amazonaws.com/somisilegex/brche_krzen_erweitern_bung.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/how_many_carbs_are_in_a_jersey_mikes_sub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/297c0feb-c93d-4d41-921b-58e1d766db7d/burijozopobubavixana.pdfIn PDF document text
    • https://s3.amazonaws.com/navoburarovada/kidamisasaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5ccf4e-3b5f-4429-ba9b-7530e432461c/74063164844.pdfIn PDF document text
    • http://mikololimudipu.rf.gd/fabofus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12c6b030-e95b-40ad-9d25-a6abd50e1c0d/robert_alter_hebrew_bible_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/91447088697.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0337e60-5f3c-4294-86de-95591cf56bed/taxode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aa41d14-9292-4d25-9809-955e263311e0/starcraft_2_legacy_of_the_void_guide.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_off00011ea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA0 5388 bytes
SHA-256: 5b5300bb7b05686d9c9fcd549ff1f7f2d0f0a9914218e79ba3d92be307659557
font_01_sfnt_off000130d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D6 11988 bytes
SHA-256: c34515b0b05e3bc408b7f0b30bb9faa60b068b338df16ef9acaec361b92ae66e

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