Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b8ee9b1ee2a0bc…

MALICIOUS

PDF

79.0 KB Created: 2021-03-24 03:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 619a2505be95b62526f6fc332a2b5873 SHA-1: b00c85fc556fe5b76ae736a1023da5dfa3477a93 SHA-256: 78b8ee9b1ee2a0bc3f8d91539dfba53d9a881258ac776f122c6b762149dfdcc6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://maypoin.ru/strik?utm_term=probabilidad+y+estadistica+schaum+cuarta+edicion+pdf PDF link annotation
    • http://italonewsero.site/what_not_to_eat_at_keto_dieta0900.pdfIn PDF document text
    • http://zoomita.space/57888348246fkr58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_60555aff79e03.pdfIn PDF document text
    • https://fevonijapa.weebly.com/uploads/1/3/4/2/134234837/3237265.pdfIn PDF document text
    • http://tumbochka.space/rapasegemisv7hfq.pdfIn PDF document text
    • http://prizyivnik.ru/sofudegivefi91ho.pdfIn PDF document text
    • http://barberking.best/ap_world_history_textbook_voyagesqgr2h.pdfIn PDF document text
    • http://cheapkeys.site/can_you_pass_cfa_level_1_in_2_monthsvpblh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_5fef60b47e3b2.pdfIn PDF document text
    • http://216tilford.com/libro_metodologia_de_la_investigacion_roberto_hernandez_sampieritbgno.pdfIn PDF document text
    • http://sfhgfje5df.xyz/the_meaning_of_marriage_devotional1l3sj.pdfIn PDF document text
    • https://firajapototirop.weebly.com/uploads/1/3/1/4/131452771/roder.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378852/normal_5fd10a00b3ea3.pdfIn PDF document text
    • http://wenamifub.22web.org/4566200969.pdfIn PDF document text
    • http://fuverujazifiso.22web.org/necronomicon_anunnaki_bible.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482020/normal_5ff03f6752bf2.pdfIn PDF document text
    • https://woxoxoba.weebly.com/uploads/1/3/4/8/134893248/1d3428c864d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387406/normal_5fdf1cc04b00c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377403/normal_601b43755bd3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jilevatawew.epizy.com/34474728779.pdfIn PDF document text
    • http://regipegor.rf.gd/acer_chromebook_15_cb3-532_upgrade.pdfIn PDF document text
    • http://worubag.epizy.com/88383343062.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_off0000f5b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B1 5640 bytes
SHA-256: 226fde5acd64acbb20b322e099d5c61f4eb0ff07c6a6b48bbc2edb2faeeec15e
font_01_sfnt_off000108b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B2 11524 bytes
SHA-256: 0aa1c6aefbcfa23c8f36ff4ee945a2cf5d96df87544c091a5b96e41f97d871c5

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