Malicious PDF — malware analysis report

Static analysis result for SHA-256 f018f4f2be338c0e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 03:38:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 97a0be667cbe6426997f68a63ce67e85 SHA-1: 3cc7497c0d4abf8e55cfdeb2e9d1bf2d545561a7 SHA-256: f018f4f2be338c0edfc99fb4826569b414db962a7e708e07730384f71bc981a3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an intent to redirect users to potentially malicious external sites, consistent with phishing or malware delivery tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://inspiredindianfoundation.org/uploads/nidetogusujoveli.pdf In PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/fitowobafasa.pdfIn PDF document text
    • https://zoldlepes.hu/userfiles/file/fatejur.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109121422392820.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/97678963917.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/78896757136.pdfIn PDF document text
    • http://www.egymast-segito.hu/uploaded/fck/file/68856935781.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210920090609.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/tapinujixabozirurerijogaj.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/xonivimugidupa.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12678767352.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/dasibi.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/xodeduterepexoxal.pdfIn PDF document text
    • http://oecschool.com/userfiles/file/famenapokewa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b1fcdfa30---jafuvexebawobuxanuwax.pdfIn PDF document text
    • https://zhansq.cn/upload/file/waxiliraguwonufikafij.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/bowileduzesojovirusosokax.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210907072403.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/6950428698.pdfIn PDF document text
    • http://jinanxintiandi.com/userfiles/files/jolebojijexo.pdfIn PDF document text
    • http://atya.eu/files/file/dawofarutevozol.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/92521389092.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=games+like+secret+neighbor+for+androidPDF link annotation
    • 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_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 17024 bytes
SHA-256: bdfd8916f6f142c90b45697e2a74265097b41855bcc3f256d84b9b947c88f794
font_01_sfnt_off000114f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0F 11196 bytes
SHA-256: 53e67387bbea5f0bb9220e4ca1b53527be36b658949c61f982f7601d9bc9f29b

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