Malicious PDF — malware analysis report

Static analysis result for SHA-256 252ea5ee8c100c17…

MALICIOUS

PDF

97.1 KB Created: 2021-03-14 02:21:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cf80d579e5581c7f6a22afc017fd43b9 SHA-1: afc51f485ba105c4c6977d511254c84fd0ed3492 SHA-256: 252ea5ee8c100c1787908a3730fb3959c509ffaa99bf9122871987b43ce69741
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, suggesting it functions as a link farm. The primary external URI points to 'seumenha.ru', which is likely part of a scheme to manipulate search engine rankings or direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9553

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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
  • 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://seumenha.ru/award?keyword=importance+of+delegation+of+authority+pdf PDF link annotation
    • http://jofarofuwudeveb.66ghz.com/what_does_wearing_a_lot_of_bracelets_mean.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/cTvKfCe/vedunetetot.pdfIn PDF document text
    • https://cdn.sqhk.co/bimowikosaru/cij59he/nails_2000_paterson_nj_hours.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/hdxhejY/jarep.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/bgcRTid/goodreads_choice_awards_2016.pdfIn PDF document text
    • http://fozasuwukoroba.iblogger.org/bodybuilding_routine_for_mass.pdfIn PDF document text
    • http://bipasuvuf.iblogger.org/left_bank_running_lean_code.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/eX1NdNn/57932169603.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/somamere/26774468418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/163bb95e-f60c-4f9c-9745-c0831c27a6ed/tujemugiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7500860f-aa12-464e-8131-6c25970ab273/32450411309.pdfIn PDF document text
    • https://d56a38bf-d62e-453c-9b5b-5b2fe88aea46.filesusr.com/ugd/359e64_03353641141c4b78bd96a317fdeef2ff.pdf?index=trueIn PDF document text
    • https://2a26c5f8-c4f8-4af8-830b-7e2c9961bd8e.filesusr.com/ugd/2e4362_8c153141f80448a0b75fed51b06cfb73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejados/vba_unselect_all_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7a7107d-753e-48b5-a359-a64ead4cdbe3/sex_and_the_city_samantha_sushi_episode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43ec78ee-26f3-4445-8cbf-4fe2ed8a11ed/xoluxaruwurilezob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b16b534-7dba-4f20-a14a-cefa7e6aa2d5/jedesikexu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f24fdad-2ade-4b41-9907-4ddde9c6a3b9/88364796704.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17014 5428 bytes
SHA-256: fca633e1f523cbb85a36a4a73d8b92bb2cfb15941cbcb73ed7523aa565f571fa

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