Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c699979fad94e8…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 10:41:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: dc5731b58e409b527a360e0bd4c05b22 SHA-1: 9b4a1a2dd380336cd91a16e65c8f1c41cab6d56b SHA-256: 93c699979fad94e88eda3c4755c2f1a06371d02d33e3440ac13a13f777131843
194 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to malicious websites. Heuristics for 'SE_PAYMENT_REDIRECT_LURE' and 'SE_CALLBACK_LURE' strongly suggest a financial fraud or tech-support scam attempt. The ML classifier and ClamAV detection further confirm its malicious nature, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://stepweystudy.com/ckfinder/userfiles/files/80914165018.pdf In PDF document text
    • http://ekouklid.eu/UserFiles/file/38597490147.pdfIn PDF document text
    • http://www.bandungmesin.com/file/sinutomezodirekodimenivo.pdfIn PDF document text
    • https://managedentalclinic.com/ckfinder/userfiles/files/pozutodibobevoderekunig.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/14066878750.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/71520863531.pdfIn PDF document text
    • https://webmenuplus.com/images/file/45896533294.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021091317113289.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/zasalusonotofeloxaripu.pdfIn PDF document text
    • https://detmers-kontejner.hr/files/vininaj.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/wuteborumilumo.pdfIn PDF document text
    • http://styropapex.pl/userfiles/file/sixexativinudumevenevuz.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/3b014dcff06d4f0f78992f5ad4ccfd4a/28565860368.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/94977711357.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/noxipizifoba.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/73909171802.pdfIn PDF document text
    • http://karthikeyanjayaram.in/userfiles/file/10419283113.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/56160584035.pdfIn PDF document text
    • http://tccsrl.org/userfiles/files/xojekejonasonovawojujudo.pdfIn PDF document text
    • https://www.colegiodomus.com.br/js/ckfinder/userfiles/files/xifutizopasaneveta.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/838f512c7318c53d9203300693b736e8/3352063461.pdfIn PDF document text
    • http://24cvety.ru/upload/files/geruxoxoduzut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=import+contact+android+to+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_off0000d9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9CD 10516 bytes
SHA-256: c617772c7876cac8d9eee3ef82064a22cce7b14fe2da77d68c2dfcc4a6d25b30
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 18124 bytes
SHA-256: 0627d2abaae71b0782ca34f66560fae1785f4af15d690d88d7d2414939b224e4
font_02_sfnt_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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