Malicious PDF — malware analysis report

Static analysis result for SHA-256 44f281346f951348…

MALICIOUS

PDF

88.5 KB Created: 2021-03-10 06:57:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 83a067724ac71d6dfc7528a546877a52 SHA-1: 5c4c16b32123dd8aff02f4923f53b03751a636d7 SHA-256: 44f281346f9513481b924aae431b7891c1c4a75ba3e6299c702edf69a631e083
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with the primary one being https://xajibur.ru/award?keyword=b+arch+paper+2020+pdf, which likely leads to a phishing or malware distribution site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external links strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/award?keyword=b+arch+paper+2020+pdf PDF link annotation
    • http://vehicleusains.com/braun_series_9_9390cc_best_pricev86qa.pdfIn PDF document text
    • http://yognat.space/nrcme_study_guidenqqko.pdfIn PDF document text
    • http://neojust.ru/starting_my_own_clothing_line_redditi9okw.pdfIn PDF document text
    • http://stylecurtains.com/ielts_speaking_part_3_topics_with_answerswzg7h.pdfIn PDF document text
    • http://lnstagramcopyrightservices.org/dobejexubapitiyscri.pdfIn PDF document text
    • http://tdsevsvet.ru/buwageripirusezogijupu7s1z3.pdfIn PDF document text
    • http://opros.xyz/cabrio_error_code_e1_f3nbndp.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/94494080905.pdfIn PDF document text
    • http://afracheat3.xyz/olmaz_olsun_cebimde_milyonlar9to41.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://terumalok.atwebpages.com/karud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/032edfe5-bd6a-4212-87e8-dc190f0ce229/nexene.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/sosiwuvegoripidunexe.pdfIn PDF document text
    • https://s3.amazonaws.com/kegovev/78739959453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c7dafe4-1fac-4fc5-8c02-3817cda0cf1e/osprey_cove_homeowners_association.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/answer_the_question_in_spanish.pdfIn PDF document text
    • https://s3.amazonaws.com/dukajevo/fishing_report_nysdec.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/idioms_worksheet_5th_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/fipadapagokomumudazek.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_off0001168f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168F 5356 bytes
SHA-256: 709d68e8240b43a89e72456bfcd991b758aca9e929446d07d34f50fc3299c537
font_01_sfnt_off000128c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C2 13844 bytes
SHA-256: 60dc3aae21be6b6df7d3716c97b3f83dfe0c2994c788fd700fc46f4cf81601c1

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