Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5a654914c2e4c0b…

MALICIOUS

PDF

81.9 KB Created: 2021-09-23 13:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd9a70118c9636648dbe2bd1ccd9290a SHA-1: 0c5f6aeb96d10f772ff29ede1e2ec39516305072 SHA-256: b5a654914c2e4c0bc8d19cc723259b507d27cc4726a463bcfe99b3132f749d16
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a fraudulent support number, a common tactic in phishing and scam operations. Embedded JavaScript was also detected, which could be used to further exploit the user or download additional malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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 http://emannsltd.com/userfiles/rudewenumalaw.pdf In PDF document text
    • http://cupta.org/userfiles/files/20210923110315.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/motiziwusazu.pdfIn PDF document text
    • http://skene.es/userfiles/file/ruvevopitojoruzefud.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/62572563214.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/22086642426.pdfIn PDF document text
    • http://hotechike.com/files/files/77819345941.pdfIn PDF document text
    • http://makairways.in/home/makairways2017/public_html/dowalumniusa/ckfinder/userfiles/files/55685535886.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/bitewazut.pdfIn PDF document text
    • https://pima-alarms.net/slicice/file/10604129224.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/laroxojoruje.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/41973540707.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/puwizobojigotupir.pdfIn PDF document text
    • http://cbafjvn.com/uploads/userfiles/file/patuwotuxivukepo.pdfIn PDF document text
    • http://kaies.cn/upfiles/210921104516977601iho8ts.pdfIn PDF document text
    • http://severstroysnab.ru/userfiles/file/24005347193.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/zakile.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/77824867197.pdfIn PDF document text
    • http://nature-revive.org/files/file/72601954109.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/9864768521.pdfIn PDF document text
    • http://nassagroup.org/app/webroot/js/ckfinder/userfiles/files/73722507080.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/77592134509.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/supujevivazi.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/52688763260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=lexis+cam+appPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e51544d853---xonijizima.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_off0000d9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E1 10124 bytes
SHA-256: 24a4933f6075037c059e9a1850acfdbca8ec0b0eb49ce284bb77810e407009ef
font_02_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 18976 bytes
SHA-256: b022a47c8469fcd5f34c19d4dc93583045d9904bcc1bddf4b61dc4083c7e23a0