Malicious PDF — malware analysis report

Static analysis result for SHA-256 98287fa1d5db89ed…

MALICIOUS

PDF

75.7 KB Created: 2021-09-18 03:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 72d92192b677ac3817dd889bc79d5260 SHA-1: a52ec9e56c671f26659532b3fe0217f012ee7b86 SHA-256: 98287fa1d5db89ede170d48eb0ba6728b49d7ca6ace5fdd7b406325e431ca02b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, with one specifically using a UTM term suggesting a lure related to 'windows 365 mail login'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. 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 0.9963

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://coretry.ru/uplcv?utm_term=windows+365+mail+login PDF link annotation
    • http://tcyy88.com/userfiles/file/2021091805472573499.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/zajipuwizaza.pdfIn PDF document text
    • http://school15-tyumen.ru/f/mukodesamirugew.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161451ebebb2a1---sureg.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/70820052372.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/79409260555.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/xibukutedipuvojuf.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/39701901686.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/laloxirabaliworowabane.pdfIn PDF document text
    • https://clove7.com/userfiles/file/bomoporirofabezasivep.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/75472504745.pdfIn PDF document text
    • http://e-hematologica.com/users/file/448405355.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/dotaludinobidul.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/53467513517.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/31108656500.pdfIn PDF document text
    • http://hebakotb.net/userfiles/file/fomajitadurapogaxowavem.pdfIn PDF document text
    • http://myphamasia.net/upload/files/48599243415.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/sonozexodoturofusimox.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/bekunivarotelafo.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/10956099725.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e30b4a80ff---81973987163.pdfIn PDF document text
    • http://accapierre.it/userfiles/files/6699391452.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_off0000c284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 10816 bytes
SHA-256: c536b78856e714c7b31bcb554cbcbf51d73f686863d759224f892b7a896fd574
font_02_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 17920 bytes
SHA-256: aa366959ae4614ddcd988a6f338ebea42d4f6ea2790494b17e6998fdeef3ca04

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