Malicious PDF — malware analysis report

Static analysis result for SHA-256 dba0983f6dee318b…

MALICIOUS

PDF

69.3 KB Created: 2021-09-24 13:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3320ae81f697eeb319003c9e19473deb SHA-1: 1ff82f3a652892638a144df5f4de0f82421c953a SHA-256: dba0983f6dee318be68c18a79fa02a199eed5b131ce90c7e60565441f5b18c76
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs and a heuristic flagging it as a link farm on disposable hosting suggests a phishing or malware distribution scheme. The 'SE_CALLBACK_LURE' heuristic further supports a phishing pretext, likely aiming to trick users into visiting a malicious URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://nomylo.ru/uplcv?utm_term=how+to+cast+pc+screen+to+phone PDF link annotation
    • http://finemetal-cn.com/upload/files/tixiwarivafa.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/gibujajulafubukuj.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/39721936816.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/vupuzapem.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/98588941409.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/28707499855.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/vezisonuteketawin.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/94456117095.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/kezikula.pdfIn PDF document text
    • https://raselapp.com/userfiles/file/kuwabevezususutoj.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-10/images/files/28593433494.pdfIn PDF document text
    • https://flyags.com/editorResources/file///vurazilitilakawilowumix.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148d4f312c68---tefabufoduxozaliwesus.pdfIn PDF document text
    • https://blgjad.com/upload/files/newubegusewazogev.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/xapadiluxegalikofuwalizu.pdfIn PDF document text
    • http://uhorder.com/upload/files/2862557665.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/buzaredomabuvebo.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/56696826221.pdfIn PDF document text
    • http://4bx.pl/public/file/28854974380.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210918211105.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bdef929ae7---8647019358.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_off0000b0ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0AD 10412 bytes
SHA-256: 28a159da054349521300873ea73f44d207319c5ce75d7f27f215e0a27c3fef34
font_01_sfnt_off0000c840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC840 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE052 15684 bytes
SHA-256: e3c175b1bf3589ac2f3860602d98ed241b5a04f996ae10c05e12160a74fe45fc

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