Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f28c0777e4a4c9a…

MALICIOUS

PDF

83.7 KB Created: 2021-02-11 08:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 5abe21abc1c7a6fd3d45a2b9b1677a05 SHA-1: 5c0deae142ed07eb81dc75c6840d8df2352581e0 SHA-256: 0f28c0777e4a4c9ab3b59a27cd14f31e173c562b7145c5fe76b121e2f099baf6
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing indicating a large number of external links, with one prominent link pointing to a suspicious domain ('you-bestshop.xyz'). The document body, though heavily obfuscated, suggests a lure related to academic formatting. The presence of multiple external URIs and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://druttle.ru/aws?utm_term=mla+format+cited+page PDF link annotation
    • http://you-bestshop.xyz/zijajele9f1e.pdfIn PDF document text
    • http://putifid.iblogger.org/gasunojizatuzedarumavurew.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/juruzuzuxipe_sewibof_penazeresig.pdfIn PDF document text
    • http://cocobuka3.xyz/sewotikemuduwetoh4opw.pdfIn PDF document text
    • https://xinulirolome.weebly.com/uploads/1/3/4/5/134599248/58997a9c5212dd.pdfIn PDF document text
    • http://fresh-ita.space/believer_song_free_in_masstamilanpiwvn.pdfIn PDF document text
    • http://repair-telefonov.ru/tosotenajawobazitaa1fd5.pdfIn PDF document text
    • http://zathkatow.xyz/53120134742vld2.pdfIn PDF document text
    • http://christinaanddavid2019.com/backus_naur_form_wikiwydff.pdfIn PDF document text
    • https://kufudazasa.weebly.com/uploads/1/3/4/6/134626120/72a01c.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/mejados/10885532966.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/91686879973.pdfIn PDF document text
    • https://s3.amazonaws.com/votawawo/7098549234.pdfIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/carrom_game_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/gps_altimeter_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/somamere/mubomawejilufovobo.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/rogijotujovig.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/capitaland_malaysia_mall_trust_annual_report_2018.pdfIn PDF document text
    • http://fesenobonirizu.epizy.com/canis_canem_edit_pc_ita.pdfIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/83730815748.pdfIn PDF document text
    • http://fotopokidag.epizy.com/21596017779.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/how_to_answer_law_exam_questions.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_off00010945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10945 5300 bytes
SHA-256: af2734f9f25946a2aa37654671052d5bcef80657404993659a3910d1a24e6f59
font_01_sfnt_off00011b4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4A 11140 bytes
SHA-256: d73a88de24a7098745d3a622f6fd5d1e8f3128bc107878e489fd40a82a23a875

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