Malicious PDF — malware analysis report

Static analysis result for SHA-256 398d54e384abdaeb…

MALICIOUS

PDF

72.7 KB Created: 2021-05-23 08:40:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 48b7a3b330bde732260f015eb1c6f128 SHA-1: e59c24561edeba6a579fe508e7cfe103ddb4d5d5 SHA-256: 398d54e384abdaebf08c4b1f5c5ab001cf6a00084895145ee4d952fda4972671
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, with a high risk score. It contains an embedded URL pointing to a suspicious domain, 'xajibur.ru', which is likely used to host a phishing page or download a secondary payload. The document body, though heavily obfuscated, suggests a lure related to 'can 8 year olds write', potentially to entice clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/strik?utm_term=can+8+year+olds+write PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce16c080-be9a-4d68-b4c6-0ee6b122c830/free_download_bible_commentary_niv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1298953d-d422-41ff-880d-166d76422721/25583855301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ecdd9c1-1f80-41cc-87a3-16cc3cb06e7c/gowixavikapazomozifona.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/gnostic_john_the_baptizer.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/endless_summer_book_1_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478d7aab-0904-4beb-bee5-08c7393f5335/mamba_max_pro_motor_limit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2882ddf-f936-49d8-a499-1c398c4b1dbc/fowemav.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/1868111403.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/how_much_is_a_antique_singer_sewing_machine_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/que_sistema_de_gobierno_tiene_venezuela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a415aacb-ad5d-4541-93d9-c3e28648b75e/dulapedulidagakiberes.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/socialismo_cientifico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83b92b0e-38a6-45d2-8fd3-308dd31f0c41/20407593136.pdfIn PDF document text
    • https://s3.amazonaws.com/tobojelusiwi/vajuvowulat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23aea300-d2d7-4bac-b6d0-069710ce30b1/wegitop.pdfIn PDF document text
    • https://s3.amazonaws.com/pojikovewijeja/wimevonavowutopenumobera.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/safikasogipitizijilemotet.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_off0000e24f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24F 5112 bytes
SHA-256: 3ef901d9edb38806c0c3bd2289dc7fa5bd46a66a2b1b43979a0510c7d91d0259
font_01_sfnt_off0000f3d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D0 10152 bytes
SHA-256: 905ffae242ee5049cb02684a5d2ddeb1d82f5fce8c49629305026a415d12474c

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