Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1c84d8d0e21e6b…

MALICIOUS

PDF

78.9 KB Created: 2021-03-06 03:47:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: eb299de1f86bd45471c22b490bb8e04a SHA-1: be25a9cdae609b4c63918318498881989ecc81e8 SHA-256: af1c84d8d0e21e6bf1e27808bf93c0cf2a8a815dc51efdf7264e27e5e691ced1
166 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-severity rule indicating suspicious links and invisible content. The ML classifier also assigned a high probability of maliciousness. The embedded URLs point to domains that are either unknown or confirmed benign, but one specific URL, http://securitycheckingbrowservkcom.xyz/damazijudijitelujetevawuj07t.pdf, is highlighted as a suspicious link lure. The document body is heavily obfuscated, preventing a clear understanding of its content, but the presence of numerous links suggests a redirection or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://soxebez.ru/wix?keyword=business+letter+worksheet+middle+school PDF link annotation
    • http://tobufupevujuma.mygamesonline.org/what_was_the_subject_of_letter_from_birmingham_jail.pdfIn PDF document text
    • http://community-day.ru/letulilomizu3tl8i.pdfIn PDF document text
    • http://apparentlyopt.com/43191822681wvsn.pdfIn PDF document text
    • http://kurs1.xyz/how_to_repair_car_wash_machinen1ru2.pdfIn PDF document text
    • https://detosujedeke.weebly.com/uploads/1/3/4/3/134371576/8172051.pdfIn PDF document text
    • https://jimekomu.weebly.com/uploads/1/3/1/4/131453536/37cc4.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/10_reasons_why_finlands_education_system_is_the_best_big_think.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469631/normal_6040a391bf485.pdfIn PDF document text
    • http://uscreditinquiry.info/poxetodekewobidonuwaz3whz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474475/normal_601bbfd2d1905.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/fifisagunage.pdfIn PDF document text
    • http://cparta.moscow/31999218139n4zfg.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/5018294.pdfIn PDF document text
    • http://losqutoq.online/math_books_for_grade_3_downloadh32uw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476420/normal_602536b748fd8.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/damazijudijitelujetevawuj07t.pdfIn PDF document text
    • http://wisitens.online/how_to_reset_rii_keyboard2kbtn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://taguloxutenafol.myartsonline.com/system_of_inequalities_word_problems_answer_key.pdfIn PDF document text
    • http://vovakupalujum.onlinewebshop.net/vepisidoguvabemijekufikof.pdfIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/what_p90x_schedule_should_i_do.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/69922772890.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/pdf_file_reader_software.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/pedakarizena.pdfIn PDF document text
    • https://s3.amazonaws.com/vogubivajavofu/pirate_king_online_fairy_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/kinuperikotibazusaje.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_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 5172 bytes
SHA-256: 3f1bcce6fbaa062d02c799797d0b7282e93b193ef087e849931ee96e09100fd6
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 10408 bytes
SHA-256: 93d8f560833eec098fa526638a45afda77d991d561bf7df06855bf8038ac8cdb

Open this report in the interactive analyzer, or submit your own file for analysis.