Malicious PDF — malware analysis report

Static analysis result for SHA-256 857cd53dff5eec75…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 12:16:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 25c4ea7e2082c3105cd0eeb1db2afd40 SHA-1: 4af592e3fd72dc05a50eef0d94b5bc6589cf558c SHA-256: 857cd53dff5eec75c3b53c51a427c778229e7162356a1e2bea6712848d4c7ee4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its image-heavy nature and the presence of clickable links. The ML classifier and ClamAV detection strongly indicate malicious intent. The document likely aims to redirect users to malicious sites hosted on IP addresses or domains found within the extracted URLs, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://iucecb.com/files/file/92961868813.pdf In PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/23504233428.pdfIn PDF document text
    • http://ovecollection.com/royal/admin/images/products/file/75538835836.pdfIn PDF document text
    • http://fitviewer.info/files/file/18981744265.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/36743380407.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/mikanajus.pdfPDF link annotation
    • http://retrolondontees.com/userfiles/file/kisuresipaje.pdfIn PDF document text
    • https://dananeye.com/uploads/files/202109202044024529.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/larotazewonodubikunugo.pdfIn PDF document text
    • http://warehousetraining.ie/images/65087894708.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/93668877258.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/65101384367.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/7991223420.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/53535629938.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/29327707026.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/kovag.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/27963864371.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffe971ef90---mefulenubiludituruguzot.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/76692989000.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/45752496271.pdfIn PDF document text
    • http://kotolantopeni.cz/file/57911168895.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/86d3fd3ac135907e7a093ce35bbd9ba9/13838258888.pdfIn PDF document text
    • http://singlesync.com/userfiles/file/76939677755.pdfIn PDF document text
    • http://jucal.es/images/file/39154816896.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=lighter+android+emulator+for+pcPDF 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_off0000b113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB113 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92A 10956 bytes
SHA-256: b083da026e6e27293c5f896d7199abbd82856c42534ebb5fc54b00791d945e92
font_02_sfnt_off0000e21d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21D 14512 bytes
SHA-256: 6c0ecbe6537bd24c3e8d78645fd170ffe5a22eaccec83025ea22739e2afbc05f