Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc522afafbe2ab60…

MALICIOUS

PDF

82.3 KB Created: 2021-09-12 15:27:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a88dbe9207a076fe00a2ea0cfd7d4cc3 SHA-1: c629b769172b886dd970bdf55292b5ff9d8808c0 SHA-256: fc522afafbe2ab6048baee6ee5eec2a9e93d9f49ce2dbca3076b12fdd8f51da1
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing and malware distribution. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a method used to evade gateway scanning. The ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://allytemp.ru/uplcv?utm_term=change+lock+screen+time+color+android PDF link annotation
    • http://guoyangmoju.com/userfiles/files/bokifalanux.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/buzorejavezexoke.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/89687473384.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/026c9efc16da276dded21d3724a066e6/42140800789.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/29083329186.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/giramu.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/xuvojerew.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/tezevufebop.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/23613783127.pdfIn PDF document text
    • http://renknh.com/ckupload/files/xudesupewilavomokonawozud.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/71113257612.pdfIn PDF document text
    • http://cuahuyhoang.com/media/ftp/file/28235029143.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/gukusukubaj.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/kosukivofazinu.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/futirarimi.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/dopunelumuto.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/9147446400.pdfIn PDF document text
    • https://red-adlay.com/upload/files/50400924810.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/zunodegu.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/lanedor.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613825b9a4850---momuvokago.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/28255030534.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/bopaperejadeza.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_off0000dec2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D9 10940 bytes
SHA-256: bae1e31ad7ce2a8dcae4ece1e171f429da072f237b2152e55603ed09d8c71b5e
font_02_sfnt_off00010fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD4 16824 bytes
SHA-256: 937f7d702bc4b478f6a9c2a182c3131cad479f150284c7430fc96f6fb6630f6a