Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2532049f7e37c44…

MALICIOUS

PDF

87.9 KB Created: 2021-06-11 09:13:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ae5e2150366663056a45e341de52f4f7 SHA-1: e8d67914967f38b278b1186ab019b59cc2ef1bfc SHA-256: d2532049f7e37c442bdf6af3929f2b956703a4ed8da2db750ba8b4f91cda229a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://drafthe.ru/pbw?utm_term=concise+medical+physiology+chaudhuri+free+download PDF link annotation
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/zerunoxa_vejetowa_xugelotomirivek_motefatemax.pdfIn PDF document text
    • https://kafakekamiv.weebly.com/uploads/1/3/4/6/134646951/teguxozexoloj_fofukaj_kapupuguvozir_giwusesevoraxus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_6039430eca927.pdfIn PDF document text
    • https://bijariruxo.weebly.com/uploads/1/3/1/3/131382387/6485613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403540/normal_6056cca2be1b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376127/normal_60bf2a54724d7.pdfIn PDF document text
    • https://nodajalij.weebly.com/uploads/1/3/5/9/135990600/727093.pdfIn PDF document text
    • https://kulitexujaw.weebly.com/uploads/1/3/4/0/134099612/sugurumuku_bawed_gilab_webemalovod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454965/normal_5fe6a6cb8b49b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474736/normal_5fd1f87bdcd5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490123/normal_603fc57f398b8.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4471256/normal_60b5400824b85.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bidudilobofu.pbworks.com/f/how_to_create_a_frequency_distribution_table_in_excel_2013.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144514086/convertir_1_cl_en_ml.pdfIn PDF document text
    • http://muzurinugaw.pbworks.com/w/file/fetch/144848538/my_dyson_stick_wont_hold_charge.pdfIn PDF document text
    • http://zivovot.pbworks.com/w/file/fetch/144631479/21774171006.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/32583470354.pdfIn PDF document text
    • http://detomipipu.pbworks.com/f/saree_blouse_cutting_and_stitching_books.pdfIn PDF document text
    • http://joxakuruvi.pbworks.com/f/zibazofozemalututupu.pdfIn PDF document text
    • http://nekimijazom.pbworks.com/f/66094426268.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/les_animaux_exercices_de_vocabulaire.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_off00011a98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A98 5668 bytes
SHA-256: db8ad355dfe09c04fa21fd5a0abd84716d3fbef7de8f287db791cefe1c5f90b7
font_01_sfnt_off00012dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DC5 10656 bytes
SHA-256: a593a8388bc39667d62868dad8ecdac753eb5b9fe625d805e1b5fea30900bfef

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