Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bbc5012f6fb8f5a…

MALICIOUS

PDF

89.4 KB Created: 2021-09-13 12:32:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ffb61464010a64432f103f64c0aee847 SHA-1: 5dc8689cc54a00816959a08019e53e59b5c9ae26 SHA-256: 2bbc5012f6fb8f5ab7a3ca0696a663031af56163fde3d5b0f27fbee111841eb7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple links to external PDFs hosted on disposable domains, indicating a phishing or scam attempt. The heuristic 'SE_CALLBACK_LURE' strongly suggests the document is designed to trick the user into calling a fraudulent phone number, likely related to fake billing or security alerts. The ML classifier and ClamAV detection further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6815cc04---fubidaruvesizekigiremedon.pdf In PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/36479592008.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/viwaxidozexamipiriw.pdfIn PDF document text
    • http://siltherm.com/ckfinder/userfiles/files/53530143020.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/58458219223.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109100902259627.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/guzixedewozonomunomazos.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/zewifo.pdfIn PDF document text
    • http://webursitet.org/Files/file/28746492233.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/mudobixalowajoradu.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/5724145400.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/rizoninivoporibo.pdfIn PDF document text
    • https://tekartltd.com/upload/files/sivopiwubimojakegadisikaz.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/17440693440.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16135ee3e9e7fc---pikirazogizidagijonubome.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/fixugekevotagegodobeb.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/70411066767.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/20784832552.pdfIn PDF document text
    • http://pnalog.ru/images/file/26785258374.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/pegejufivilusodebegorelaz.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/tepanaxekorekafovozima.pdfIn PDF document text
    • https://robertbah.si/files/file/48861131874.pdfIn PDF document text
    • https://aramlasmerok.hu/uploads/file/vorugesesitexanidojalug.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/luvanukokev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+earbuds+2020+under+50PDF 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_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 10652 bytes
SHA-256: 431a4650c5c3dd8832c0a27d2cba345e3f19525fd9b49a393ef248cc0195b3fe
font_01_sfnt_off0001116f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12981 17716 bytes
SHA-256: 3cd039d498f9dc0947282d6e137612e853a3c559ffee73f468e59db23961e2a6

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