Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ca78ccce89f0410…

MALICIOUS

PDF

69.5 KB Created: 2021-10-01 15:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b00e52de943d8d1ab91d4dcc1f1c4f3b SHA-1: 864fc3f57f3f157d963fb740d850561c412b3dcb SHA-256: 6ca78ccce89f04101187a0bdd41dc8bc9b8ff7029c31d0a1c4556c9b1cdb4f0f
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It employs an image-based lure, typical of phishing attacks, to entice users to click on embedded links. The document contains numerous external URIs, including one pointing to a raw IP address, suggesting an attempt to redirect users to malicious content or download further stages. No scripts were extracted, but the PDF structure and URI usage are indicative of a malicious intent to compromise the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gesht.ru/admin/ckfinder/userfiles/files/77758114593.pdf In PDF document text
    • http://massarentearchitettura.com/userfiles/files/11959571112.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f4672c0e50---bivudisavadoviter.pdfIn PDF document text
    • http://riasztoszolnok.hu/admin/fck_upload/file/wetaridujakomatisafugi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea45b5ce3---61285665369.pdfPDF link annotation
    • http://xn--aknmedcal-wpbe.com/uploads/file/kaboz.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/49999582924.pdfIn PDF document text
    • http://vizit-k.net/uploads/editor/files/xoxefekusa.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/setutisalosuwuburesomeso.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210905_A8C8C519944A3224.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-9-19/20210919015809170797.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/96564337819.pdfIn PDF document text
    • http://ahdjcm.com/upload/files/benuzeninufi.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/mozen.pdfIn PDF document text
    • http://1careglobal.com/upload/files/20935880635.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/pokajamedafitemibi.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/kotevux.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/wiboxuwipinuneditexakuze.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/72523073598.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/mebozuwetaza.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/sajelukilogazalabobiguga.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/32493977320.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/35155545496.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/xozikoson.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/sofokamenoxulegaxefunub.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/nirojiwazuletumezu.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/16092333355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+watch+live+match+on+iphonePDF 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_off0000b577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8E 10516 bytes
SHA-256: 44437748279af5a253ce6a72b6630966eed99438b9b5ecabfa85bff5bd1baf1f
font_02_sfnt_off0000e549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE549 13948 bytes
SHA-256: 11f1cdd40ad403e21f7945bb3c08bc8f18a200d07c2be2a851abc3f226ba1d00