Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2238e697fe1db6a…

MALICIOUS

PDF

79.5 KB Created: 2021-09-20 07:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a6d4e844dba6af6356d909472d05ed66 SHA-1: 729a52753726fe539f3c754629b4b6489b3bf416 SHA-256: a2238e697fe1db6a664f7f068cfdf84c3350939dd66cb281af268d7346039aed
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one specifically identified as a potential download link. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or tech-support scam pretext. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://queure.ru/uplcv?utm_term=mcb+app+download+apk PDF link annotation
    • http://parfumland.sk/upl/jenuxodezenofonuvi.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/gidizoxodagopotogimaj.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/zekinuz.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/tokinumekelewomakenej.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/masadonaxeri.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/dokifuduf.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137158a2f9cd---44748007733.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/4470765683.pdfIn PDF document text
    • http://lukinserv.hu/file/62588558271.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d04e447064---81142740469.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/79868616312.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/1015630518.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/69373368891.pdfIn PDF document text
    • http://www.og2c.com/images/file/79212371932.pdfIn PDF document text
    • http://t-cso.com/upload/file_folder/file/472420195.pdfIn PDF document text
    • http://sarljarry.fr/userfiles/file/73592234387.pdfIn PDF document text
    • http://russia-ex.com/images/blog/file/48379902699.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/xikomojovuwajuzigaj.pdfIn PDF document text
    • https://datenglagi.com/contents/files/72420455356.pdfIn PDF document text
    • http://kerekesvillszer.hu/UserFiles/file/29611438784.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/mapefuxigaf.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/59246351180.pdfIn PDF document text
    • http://namadagaskare.ru/ckfinder/userfiles/files/zorezubu.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/bamexowigifira.pdfIn PDF document text
    • http://parfumland.sk/upl/97368835559.pdfIn PDF document text
    • http://ducthanggroup.com/webroot/img/files/42026572908.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/96814712303.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_off0000cf48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF48 10228 bytes
SHA-256: 4f5f0bda6598f96e390dd3890e7bc80e382b146a9b14888315be1ffd6647d1ec
font_01_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE40 19288 bytes
SHA-256: f75776475afe4d6e001bc0d272c33bdb2097d247a59714658b3f9a258356c5f9