Malicious PDF — malware analysis report

Static analysis result for SHA-256 52020768eefa4d12…

MALICIOUS

PDF

89.2 KB Created: 2021-09-11 12:11:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ac6993676379bc94253cb23eeb69453c SHA-1: 1d2d84deb8771d93607df65636b7653f5eac4341 SHA-256: 52020768eefa4d12f5eb8c19fbcd57b73238d0010913baeda6ad257ba0227d2d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The numerous embedded URLs, many with 'utm_term' parameters, suggest a link farm designed to redirect users to malicious content, potentially a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://huntic.ru/uplcv?utm_term=psp+3+emulator+for+android PDF link annotation
    • http://dansensvenner.dk/imagesfile///67707102568.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/tizoleliziko.pdfIn PDF document text
    • https://cdmsig1.com/ckfinder/userfiles/files/vakuwebujile.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/sd25nsgaossuh21i1v6q71oc63/49362893134.pdfIn PDF document text
    • http://flashdisplay.net/UploadFiles/FCKeditor/20210908154537.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/togajuriwelorevagefop.pdfIn PDF document text
    • https://blugarden.eu/file/namadosutenapovoxa.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/dorakidexufuluxugelujalof.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/lifererusoxu.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/minuwipaxipevarola.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/92510446835.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/masimix.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/161366c7fd80b3---66051685451.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/94892300674.pdfIn PDF document text
    • http://ibb-online.ru/f/file/1720527372.pdfIn PDF document text
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/mibakamo.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/wuwasobonitobe.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/vidiwoso.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/46020338576.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/moxesijijukajogam.pdfIn PDF document text
    • http://hmed.vn/upload/files/65521605527.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/37472729030.pdfIn PDF document text
    • https://digicpictures.com/downloads/xegumijebamerexezojulix.pdfIn PDF document text
    • http://sun-tes.ru/files/file/50478262126.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/zikugobepop.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E2 10932 bytes
SHA-256: 16a57e060a373946cd45e2b84056bc906e12e3fb2010563ed05c84995e2ba0b5
font_01_sfnt_off00011034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11034 18496 bytes
SHA-256: d41bd7c2483c8d3ff8bf648a125c474c8edb522c15921a4521fc168596d929e9
font_02_sfnt_off00013f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F33 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1