Malicious PDF — malware analysis report

Static analysis result for SHA-256 404abeb86ec6c0f1…

MALICIOUS

PDF

78.7 KB Created: 2021-05-15 04:02:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 7d0b3a20cda04cf01328d5f6cd50ef38 SHA-1: 751b2c64ae224f5b9153031930e1db43db4cfc0d SHA-256: 404abeb86ec6c0f1b08cdefbb4fea33ed902b0eb9596fc8bd696e4936ab67ddc
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URL `https://pelibifir.ru/strik?utm_term=kidde+kn-cosm-iba+won%2527t+stop+beeping` is likely part of the malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pelibifir.ru/strik?utm_term=kidde+kn-cosm-iba+won%2527t+stop+beeping PDF link annotation
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/212300.pdfIn PDF document text
    • https://meporolokiso.weebly.com/uploads/1/3/2/6/132681401/4a6f32170dcd.pdfIn PDF document text
    • https://fomoxizukewoviw.weebly.com/uploads/1/3/0/7/130739072/f0b8766afeec7a7.pdfIn PDF document text
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/f4c24.pdfIn PDF document text
    • https://movobukibajub.weebly.com/uploads/1/3/4/5/134597216/c13069f9adabec.pdfIn PDF document text
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/4346763.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/jarinu.pdfIn PDF document text
    • https://fakegegi.weebly.com/uploads/1/3/5/3/135312823/5078276.pdfIn PDF document text
    • http://fukatamuvubigo.iblogger.org/alita_battle_angel_telugu_dubbed_movie_download.pdfIn PDF document text
    • http://lubenoredeji.mypressonline.com/zinanijanusamakufafita.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/risalenefazozo/english_christian_songs_album.pdfIn PDF document text
    • http://numumodi.epizy.com/apostrophes_for_possession_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/gedexim/ps3_controller_on_pc_reddit.pdfIn PDF document text
    • http://lukafimagog.atwebpages.com/it_book_chapter_3_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/zujugovironopemeson.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/proform_cardio_hiit_elliptical_cross_trainer.pdfIn PDF document text
    • http://kiziwekez.rf.gd/teoria_sobre_el_aprendizaje_significativo.pdfIn PDF document text
    • http://pitupeg.epizy.com/wenakofapo.pdfIn PDF document text
    • http://xatulebebulife.rf.gd/action_words_worksheet_for_grade_1.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/kenapa_google_play_store_pending.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_off0000e8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AC 5384 bytes
SHA-256: 6fc04fa58312eea0c526bfb0bc992f2b850f01edddb9726637a8efcf7a15c01d
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 10608 bytes
SHA-256: 65a1f36ef990d078f03bcb29f685e34c30947d12e9d7cc72354bfe25149ee1c4
font_02_sfnt_off00011f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F40 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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