Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc05ca875b40e3cc…

MALICIOUS

PDF

78.0 KB Created: 2021-03-20 19:51:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 91f155b919de844c7d820bafc705fea2 SHA-1: ba98c53af0094fe9b9d84db3e1a30e664bcd18a7 SHA-256: bc05ca875b40e3ccd9b9cc1169c123e0901b231e65e71f7d59ef35263be0f003
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a malicious link farm and potential phishing lure. The presence of numerous external links, including a link farm heuristic, suggests an attempt to redirect users to malicious sites or to manipulate search engine results. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=ctet+exam+syllabus+2020+pdf+download PDF link annotation
    • http://sandwichhq.club/59382105852igsqq.pdfIn PDF document text
    • https://nazolaruwesibag.weebly.com/uploads/1/3/1/4/131453197/1076705.pdfIn PDF document text
    • https://debinezituxi.weebly.com/uploads/1/3/4/3/134339783/4510399.pdfIn PDF document text
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/50e628f.pdfIn PDF document text
    • http://esclub.pro/vazorupegerejuiqg.pdfIn PDF document text
    • http://aydym.club/763487591399u7f5.pdfIn PDF document text
    • http://bitsracing.net/hot_springs_hot_tub_error_codeszyl02.pdfIn PDF document text
    • https://butijewib.weebly.com/uploads/1/3/4/8/134886415/43a56407d.pdfIn PDF document text
    • https://fedaxowazujiwiz.weebly.com/uploads/1/3/4/0/134012387/1213705.pdfIn PDF document text
    • http://dragonflysagewellness.com/wifuwokoniwiu0kkt.pdfIn PDF document text
    • http://carinsusa.info/spanish_food_dictionary38if6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425726/normal_6018b6eada6d5.pdfIn PDF document text
    • http://winoorama.fun/tojexofefudagumub7cb3a.pdfIn PDF document text
    • http://photoforce.ru/57925444148cz0xv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412768/normal_6013c61c3d00b.pdfIn PDF document text
    • http://okclub.org/company_logo_template_freethspq.pdfIn PDF document text
    • https://nutomejeti.weebly.com/uploads/1/3/4/7/134702699/dizuzubakabomapove.pdfIn PDF document text
    • https://rebejudan.weebly.com/uploads/1/3/5/3/135316845/3c9bc.pdfIn PDF document text
    • https://jiwebatije.weebly.com/uploads/1/3/3/9/133997557/4627808.pdfIn PDF document text
    • https://babifufagisuku.weebly.com/uploads/1/3/4/6/134605010/futaripe-dexeremoluw-milefawanonepe-gugivosoxazalu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464710/normal_5ffbe69587fd6.pdfIn PDF document text
    • http://bluhgang.best/brother_hl-2240_laser_printer_user_manualcbdfz.pdfIn PDF document text
    • http://losinglotterynumbers.com/74065912823bkyrg.pdfIn PDF document text
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/91e88e6b.pdfIn PDF document text
    • http://taher-tcac.com/tazonubumodalofezefowefewgruej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 5672 bytes
SHA-256: 348ddca02d0206e509e291bb09ded23f6b57d57ba0624f7491956a4f9070b187
font_01_sfnt_off00010486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10486 10608 bytes
SHA-256: 2675bcb06e9f1afb00a8e6fc1a6ecbb9d65535bd75d37ff9ea5f602140cc7597