Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d57517eb038ec8…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 12:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee1dbf56dca2c189bbbe846e2aaa0f3e SHA-1: 2219e8e564443e404a036eda5719943348f6b4b8 SHA-256: 26d57517eb038ec8b282bf9410f03fad61ef7ebc0c08cfa86d68085f7ae473ed
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, with heuristics indicating it is a callback phishing lure. Although no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to direct users to malicious sites or initiate contact for fraudulent purposes. The presence of numerous embedded URLs, many pointing to unknown domains, further supports a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dynasty888.com/image/files/20210910_151715.pdf In PDF document text
    • http://imhkayseri.com/resimler/files/3428373937.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/kodik.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/14181270388.pdfIn PDF document text
    • http://full814.com/upload/files/luxokojezedoxarejasivos.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/befiluparujunudovu.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/83947651152.pdfIn PDF document text
    • https://la-klamm.org/Files/files/vubisogakuton.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/vidorak.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/gagesaxa.pdfIn PDF document text
    • http://slovbau.sk/test/userfiles/file/venamofuxutej.pdfIn PDF document text
    • https://smartbrand.ro/mm/file/81063964336.pdfIn PDF document text
    • https://clinicscrm.com/img/files/setazekarexojodap.pdfIn PDF document text
    • http://trumoi-khutrung.com/upload/files/32370364831.pdfIn PDF document text
    • http://flexicourse.cz/res/file/81982725343.pdfIn PDF document text
    • https://loyd.rs/images/file/kudenub.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/julutizutetenigepifo.pdfIn PDF document text
    • http://foxhill101.com/userimages/13541495954.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/574561988.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/51156623778.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329a5d693fa---85329706278.pdfIn PDF document text
    • http://centronegozi.com/public/zozobutepunamevupovut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=how+to+clear+cache+from+all+appsPDF 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_off0000d34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34C 10628 bytes
SHA-256: 660cee547dcbe331f92754a5a4c17552d8fa2373d053016457e1b6a6b2eee208
font_01_sfnt_off0000ebac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 16616 bytes
SHA-256: 68b47cb75d0fdf4c52ae0a9b0b67567dd19fb1d187cc7428c2fe35e980a9a532

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