Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dd2d70b5a36ee45…

MALICIOUS

PDF

74.5 KB Created: 2021-09-17 00:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1a521e47f983e7789ee984e2dc6daea8 SHA-1: 21b725632de352561f56b47c6d5c5b4bfdf79434 SHA-256: 1dd2d70b5a36ee4524c12792c640f3fcd60764a51cb4760f15af9328e1085cef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to form a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396c5fc03cd---13431938504.pdf In PDF document text
    • http://inistor.com/ufiles/files/bemelufevilukibit.pdfIn PDF document text
    • https://cauthinh.com/luutru/files/nefurututegit.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/50610773019.pdfIn PDF document text
    • https://rintrans.com/files/48505630430.pdfIn PDF document text
    • http://elmbbq.com/uploads/files/70058526181.pdfIn PDF document text
    • https://elmawadah.com/userfiles/file/43433310581.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/betobofaki.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/36413241434.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/netefes.pdfIn PDF document text
    • http://baozhaopharma.com/upload/files/55199133782.pdfIn PDF document text
    • http://erpsamik.com/ckfinder/userfiles/files/91819980285.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/36743281225.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1631489743.pdfIn PDF document text
    • http://soles2walk.cz/data/file/54942541989.pdfIn PDF document text
    • http://dorinhawear.com/admin/fckeditor/editor/filemanager/connectors/php/fckeditor/editor/filemanager/connectors/php/userfiles/file/pofetim.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/siwotodax.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090812343473499.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/muvisozuwuban.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/pipalafid.pdfIn PDF document text
    • http://jn-zhsc.com/upload/38295490638.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/33555223327.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613409a034229---kixugasudapobufenuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=black+panther+movies123PDF 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_off0000bf1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1E 11192 bytes
SHA-256: 0a67aa529b0edcd58454df7b94918b5bfa6e5c2aaef8a4f24f8a80eacc9321eb
font_01_sfnt_off0000d94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94D 16816 bytes
SHA-256: 5d625b093b03008dd084e5bad5746b4bf44baf0ade7ede409d022bc22d942eb8
font_02_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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