Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e38890bb5d8442…

MALICIOUS

PDF

72.6 KB Created: 2021-02-25 05:06:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d861b515c0f50e2f4f3abefabcc3c253 SHA-1: c93946231d86c508a51ed61032319429229bb239 SHA-256: d5e38890bb5d84428e7203f195624055b71aa9d9c0c52c052729dbd72d24f4c0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external links to other PDFs hosted on disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO manipulation or to distribute further malware. The primary IOCs are the numerous external URLs pointing to potentially malicious or unwanted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • 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://maypoin.ru/123?utm_term=armitron+pro+sport+watch+manual+40%252F8284 PDF link annotation
    • https://foraketarikovef.weebly.com/uploads/1/3/4/6/134608655/2850073.pdfIn PDF document text
    • https://jafelabuz.weebly.com/uploads/1/3/1/3/131398525/rakosefa_kadineba.pdfIn PDF document text
    • https://nafugawiwira.weebly.com/uploads/1/3/1/4/131438392/wuzifenovevuxid.pdfIn PDF document text
    • https://wasatetokis.weebly.com/uploads/1/3/4/5/134513062/nobofedabofe.pdfIn PDF document text
    • https://cdn.sqhk.co/naxudufejik/hgSw7hj/gejajiwususagezato.pdfIn PDF document text
    • https://cdn.sqhk.co/xixofivib/jaIgdzr/pupilpath_teacher_login.pdfIn PDF document text
    • https://nonaxoboru.weebly.com/uploads/1/3/4/4/134467623/9581222.pdfIn PDF document text
    • http://miniluk.22web.org/29150470923.pdfIn PDF document text
    • https://nipetetoxijekuj.weebly.com/uploads/1/3/4/7/134718304/af64e613985.pdfIn PDF document text
    • http://kepovimobezozo.iblogger.org/child_custody_declaration_letter_template.pdfIn PDF document text
    • https://latejurudawiron.weebly.com/uploads/1/3/2/7/132740343/tawax-warivitimoj-fowedu-kedasezi.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/gdlje9P/luminocity_festival_tickets_discount_code.pdfIn PDF document text
    • http://xasujaru.22web.org/dance_monkey_lyrics.pdfIn PDF document text
    • https://faxusonugavipil.weebly.com/uploads/1/3/4/7/134741565/8574648.pdfIn PDF document text
    • https://cdn.sqhk.co/xoraxuvonaf/oopT4jh/death_road_to_canada_marathon_mode_tips.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wudifubugufejab.rf.gd/trauma_release_exercises_psoas.pdfIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/26484735855.pdfIn PDF document text
    • http://nopizapokife.epizy.com/25177717586.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/aves_sin_nido_resumen_de_cada_capitulo.pdfIn PDF document text
    • http://nulukuduvi.rf.gd/balo_da_informatica_sumare.pdfIn PDF document text
    • https://s3.amazonaws.com/sefipa/best_antivirus_for_android_phones.pdfIn PDF document text
    • http://zaxawogaxema.epizy.com/simplifying_complex_numbers_independent_practice_worksheet_answers.pdfIn PDF document text
    • http://vapedefomagejev.epizy.com/wopazuxav.pdfIn PDF document text
    • http://fuzuwami.epizy.com/cam_electromobility_report_2019.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_off0000dd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2C 5848 bytes
SHA-256: 013d2523ab389f3d2bcc687f7bb20b8d95fd1756e277b69ce2fcf7af02993834
font_01_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 10688 bytes
SHA-256: da13e24c7a5d870b26d3d82a3e835a1b70eda0dd2ffc85784da2332ee0560b44

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