Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e1c765d9c372aba…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 20:49:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 45372b775b338741484e49acae4beb1f SHA-1: 1a82719ff7455aca6c597ddb2ea618f474727d3b SHA-256: 1e1c765d9c372aba61b2f35ed4fd1e91b5baed68fbb56e5d1bddf989d19a3848
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URLs, suggesting it's designed to redirect users to malicious sites or download further payloads. The heuristic 'SE_CALLBACK_LURE' further suggests a phishing or tech-support scam pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=call+of+duty+quotes+funny
    • http://cmtdental.com/upload/ckimg/files/47536229672.pdf
    • http://optometrystaprzemysl.pl/userfiles/file/23598379423.pdf
    • https://eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/42385985509.pdf
    • https://baxsporthorses.nl/userfiles/file/rixabagumegurofelonok.pdf
    • https://rrr71.ru/upload_picture/74335375090.pdf
    • http://kidneytracker.com/ckfinder/userfiles/files/xunigepabosakija.pdf
    • http://www.shjkyq.com/up_files/FCK/file/jokopegawobej.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613186899e2fb---38889784706.pdf
    • https://umiyawoodworks.com/fckdb/userfiles/file/38311156288.pdf
    • https://aventura-agence.lu/userfiles/files/sogud.pdf
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/patilufigupekizub.pdf
    • http://ichieh.tw/uploads/files/202109091214328305.pdf
    • http://taxfreepoint.com/file/kovuvoboxujidul.pdf
    • http://di-tech.kr/fckeditor/userfiles/file/kamixogitoxajozi.pdf
    • http://roocenter.ru/upload/file/93616190172.pdf
    • http://entryexpress.online/chapter_images/files/nalumutoborosogetajuniw.pdf
    • http://sabaispa.net/userfiles/file/2067620099.pdf
    • http://intertribo.sk/files/62667495814.pdf
    • https://actor-conseil.com/files/file/luloguleluterenajirusem.pdf
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f48e7d3957---7987530581.pdf
    • http://thepducphat.com/upload/files/sixawixamibegaxujetix.pdf
    • https://maintogelonline2.org/contents/files/32723663786.pdf
    • http://www.idukkidiocese.org/files/js/ckfinder/userfiles/files/80719241614.pdf
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/89644838632.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecde.bin
448d2bdf4b6d8a8a66cb9da0d168f65ee35dab986a6abfd444b2b3383a4eeda4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECDE 18408 bytes
font_01_sfnt_off00011d03.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D03 16792 bytes
font_02_sfnt_off0001351a.bin
21208eb8f81b0437eec1356c6fbca6da2f709fc561bfd2dae19d0a9f74ceb02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1351A 10544 bytes

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