Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d518b53745f46c…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 09:26:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 39a3611e6eec2dabd75c0696e3831f7a SHA-1: e729cbc4cb85a96b64ab63452c25c1e59832beea SHA-256: 99d518b53745f46c2daafa84f0e91c103ee87cc441a245925051c425475c578e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'SE_CALLBACK_LURE' suggests a phishing or scam pretext, and the presence of embedded URLs aligns with techniques used to deliver secondary payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • 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://queure.ru/uplcv?utm_term=watch+football+online+free+best+sites PDF link annotation
    • http://wsmr.us/userfiles/file/pezewu.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/dijenerugove.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/67757248185.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/vopukabozugotuwiwakovoli.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/72997025325.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/jiniwigu.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/74349619861.pdfIn PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/50912620844.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/49544211001.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161404825dead7---merozuzodiwa.pdfIn PDF document text
    • http://haki.vn/uploads/files/6745755797.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/sopojiduxivoni.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/55560934063.pdfIn PDF document text
    • http://tao-oita.com/admin/upload_filesfile/kajaduneroravezugemab.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/wizuwosefefonokenoleduzer.pdfIn PDF document text
    • http://hospitalityroyal.com/upload_files/file/vuwagolusezijekakogevado.pdfIn PDF document text
    • http://atrsara.ir/resource/files/2029852043.pdfIn PDF document text
    • http://dainindo.com/Uploads/userfiles/files/58604471180.pdfIn PDF document text
    • http://spharma.ua/files/file/ruvelajozufivabetisofaxob.pdfIn PDF document text
    • http://livilgirls.com/files/xawizomotekunod.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/45424198133.pdfIn PDF document text
    • https://egc.ecrom.work/syo/files/40236937000.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_off0000c4e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFA 10568 bytes
SHA-256: d59d1cbfb6502abebb496ad304555dd304204ce36d06f6b2c88f7542eab6b610
font_02_sfnt_off0000f512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF512 16948 bytes
SHA-256: c888b7f35c7bd2ecca0db58d249a8a783fc4f28ca9f80023987fa4a9a569b92e

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