Malicious PDF — malware analysis report

Static analysis result for SHA-256 2383ab0e96717b27…

MALICIOUS

PDF

82.1 KB Created: 2021-05-30 06:22:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: fd170f0ab1941772daed7029cb1bffc3 SHA-1: 22ce191c563f7e1aa9101657370fff17e6463e3c SHA-256: 2383ab0e96717b27b9282e2895a4ba9541403f59d6181c2e94eedfb8629010c4
156 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, with one pointing to 'xajibur.ru', suggesting a link farm or phishing attempt. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xajibur.ru/123?utm_term=interest+rate+parity+theory+with+examples+pdf PDF link annotation
    • https://jepalojut.weebly.com/uploads/1/3/4/8/134863082/a9a397937.pdfIn PDF document text
    • https://nunubawuguxage.weebly.com/uploads/1/3/7/5/137504951/ef671cbee661832.pdfIn PDF document text
    • https://ziwevanefenej.weebly.com/uploads/1/3/4/5/134591483/nezesafuzurulifotu.pdfIn PDF document text
    • https://motawifuliwax.weebly.com/uploads/1/3/3/9/133999363/0049cb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32e82f47-2f8f-43be-a55b-d5b55428f694/barrons_ap_music_theory_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd912256-a434-4107-b01c-0b4c92abc20c/10493316606.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b94f9afe-a926-4c2d-8130-760295c8a73f/computational_fluid_dynamics_hoffmann_vol_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61402b9f-55fb-4692-9532-5db2d2d0a6c6/romaxitigadubufube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33f0d592-7445-47e2-83a4-a5f3a1bbb721/rider_waite_tarot_deck_buy_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df940c98-35a6-47a9-a73b-1256c693c917/30946913725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7886f2-70fa-43ca-9b8f-32d7843fd074/tatajijuxosivozuvus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6de4c8ca-23b4-45f9-a499-0f2dbf0ff3bd/what_sign_is_november_birthday.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d61e339-3be3-42c4-b87f-ccea3836fe1a/karr_alarm_issues.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49dcb891-7bea-4233-b528-a1da2598899d/rijivexijewoxuwovi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/607e5368-1407-4ad6-b577-71ccfa738c61/how_much_oil_does_a_huskee_lawn_mower_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22b3333a-b3d7-4e59-870b-75aeaf1e4684/85666847837.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/611413f3-ee45-4f54-8278-e30e36c91509/past_simple_irregular_verbs_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a9b5764-063b-4baa-a5a8-3527d5ff0d11/are_air_purifiers_safe_for_newborns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d702fb-cf9b-4911-9450-5debbfc0ff38/60347821501.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_off000100c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C3 5480 bytes
SHA-256: 29b61b2721d07c649842bb5dcefe29a02a6ffcf546c377aa84995f889e0f403d
font_01_sfnt_off0001135a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135A 11732 bytes
SHA-256: 55f2bc09b9f643dc238ea25cb105837ecf45c7e252f99b8c76ff36ca7dca4880

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