Malicious PDF — malware analysis report

Static analysis result for SHA-256 56afedd8ac469eff…

MALICIOUS

PDF

87.6 KB Created: 2021-09-12 09:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 072e3172995fbe5a6d08a849704e8f55 SHA-1: cbb675fd440d7dda4cabd1314f3237b5418a7665 SHA-256: 56afedd8ac469effdba18e5511171baa725be93fe1cf8a299fcf9f98325e5844
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains numerous embedded URLs pointing to various PDF files hosted on different domains, suggesting a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to lead the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://chulintemple.org/CKEdit/upload/files/31565285264.pdf In PDF document text
    • http://olgapolyakova.de/files/files/memisosuko.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/piwalum.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16138381b5671e---nevixaxamefebamevusovuf.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/sipupejatuvororidom.pdfIn PDF document text
    • https://jensbrode.de/files/file/74376128245.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/25534420131.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/45185916604.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/62003653786.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/12280116560.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-11/20210911120334578442.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/xizejivemojagibosinuzab.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kujunugutimafimiropoku.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/24513756402.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/tivuxated.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/pixiburipidu.pdfIn PDF document text
    • http://xinshifm.com/userfiles/file/17932734534.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/2339785540.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/68147514110.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/dakolu.pdfIn PDF document text
    • http://ceroki.com/image/files/jotesidutu.pdfIn PDF document text
    • https://thegmsbihta.in/userfiles/file/pinorutekafamewi.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/wuximumijexazikutaliwewiz.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/xodozikipizibofofalaka.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/28754436509.pdfIn PDF document text
    • http://wwsm-us.com/files/file/rofati.pdfIn PDF document text
    • http://ctyrkolky-gamax.cz/data/dokumenty/25077635255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=harga+hp+nokia+x+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_off0000f1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DF 10412 bytes
SHA-256: 94ea90ff11d212ad4955cb3e66eeb6a865fdda53dee5360f6310debd779c803b
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001211e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1211E 18184 bytes
SHA-256: 0b8059916833ed71dc716141412338d421f30ac66ac42d0eaad4aac16c3d1b87