Malicious PDF — malware analysis report

Static analysis result for SHA-256 175bd7269eade5bc…

MALICIOUS

PDF

87.1 KB Created: 2021-06-08 02:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 36e8b7bf75bc474ef6b1a0554d60c0a7 SHA-1: 5eae4fd72c422319fd936e3ad4c1675169162360 SHA-256: 175bd7269eade5bc040d76dd6a17622e00797b641e809d9fcaa36311e7c49983
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to disposable hosting and link farms, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. One prominent URL, https://coretry.ru/pbw?utm_term=what+does+metamerism+mean, is flagged as external and associated with the malicious verdict. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://coretry.ru/pbw?utm_term=what+does+metamerism+mean PDF link annotation
    • https://molesomux.weebly.com/uploads/1/3/2/6/132681378/zexezazikif.pdfIn PDF document text
    • https://tasunukalen.weebly.com/uploads/1/3/4/8/134888382/d0832d46f.pdfIn PDF document text
    • https://takadoturig.weebly.com/uploads/1/3/4/1/134108809/7773200.pdfIn PDF document text
    • https://xutogimumunode.weebly.com/uploads/1/3/4/3/134375265/besinas.pdfIn PDF document text
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/fe4c8b41158855.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://poxanoralanu.pbworks.com/f/invitacion_de_cumpleaos_unicornio_para_imprimir.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144680640/36814687833.pdfIn PDF document text
    • http://nomebazeregi.pbworks.com/w/file/fetch/144763896/moparedidoru.pdfIn PDF document text
    • http://fijovolumi.pbworks.com/f/xerudimebobabozu.pdfIn PDF document text
    • http://seromazu.pbworks.com/w/file/fetch/144634326/vomiting_pumpkin_stencils_free.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144825300/how_much_money_do_you_make_in_the_fbi_behavioral_analysis_unit.pdfIn PDF document text
    • http://mopevot.pbworks.com/w/file/fetch/144822447/24306845824.pdfIn PDF document text
    • http://tuvovazuvezo.pbworks.com/f/geometry_worksheet_angles_of_elevation_and_depression_answers.pdfIn PDF document text
    • http://gupiguna.pbworks.com/f/why_does_my_ooze_charger_blink_red_and_green.pdfIn PDF document text
    • http://lifabukis.pbworks.com/f/83463413535.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/what_are_bad_character_qualities.pdfIn PDF document text
    • http://betifabito.pbworks.com/w/file/fetch/144755385/voxufe.pdfIn PDF document text
    • http://figinav.pbworks.com/w/file/fetch/144542103/is_high_fat_diet_bad_for_cholesterol.pdfIn PDF document text
    • http://popuwepux.pbworks.com/w/file/fetch/144610188/bible_verses_with_explanation.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1C 5104 bytes
SHA-256: ecfc2d983084f05c34010cc1928cedbf8f57936c72c4421ecf58212003757ae4
font_01_sfnt_off0000f028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF028 5048 bytes
SHA-256: 5c44225b099f0b2f00d718b904a3203f22e8ddcd04c3d896446f56d077a4203b
font_02_sfnt_off0001012f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012F 12856 bytes
SHA-256: 5ce1b1775ba3895668b3eaa2160097e1c700c53fbb9f11c70d3fefd47b3d45cb
font_03_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 16796 bytes
SHA-256: e595d9dd2249c2951c2404b0e642c6f3bf54572d24983aefc58ed22b107e1079
font_04_sfnt_off00014251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14251 2992 bytes
SHA-256: 75a349dca85db395f580d91d93b287a5cbdae605477401963f35ce112efd2a8d