Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1849121a703428d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-21 22:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5719873b1277d3ae7e61141cb3ede426 SHA-1: 85ab952660819345389fa191935c3885452a36d6 SHA-256: d1849121a703428d90607d336ffe8d32c6d563b649f3e62e78e438739fa56c53
154 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URIs suggest the document is designed to exploit vulnerabilities or redirect users to malicious sites. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the user is prompted to call a number for a fake issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=device+storage+analyzer+pro+apk PDF link annotation
    • http://garagehayashi.com/js/upload/files/bogunisa.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/wapikukat.pdfIn PDF document text
    • https://invest.pl/userfiles/file/defixafepomorore.pdfIn PDF document text
    • http://studiomilano.eu/userfiles/files/75836588765.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/kalijoze.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/porupanipetizogofesoviwu.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/62365097884.pdfIn PDF document text
    • http://gediklimakinahidrolik.com/resimler/files/pirizixetutofid.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/56021978885.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/40530814615.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/122538441.pdfIn PDF document text
    • http://humanlitech.com/files/files/vojizulejavojevusunij.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109141905039070.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/zunusaw.pdfIn PDF document text
    • http://chinalabware.net/d/files/38277799958.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/63115789939.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/wawajizimokajijedo.pdfIn PDF document text
    • http://tareeapartment.com/user_img/files/10672879514.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/51262653423.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/33501931677.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149df3b5410f---poralomemavujexozata.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/57298004077.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/96826503067.pdfIn PDF document text
    • http://alibabashipping.com/userfiles/file/zasugisif.pdfIn PDF document text
    • http://comlark.ru/userfiles/files/84247340056.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/92594574247.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/11222246880.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_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 17916 bytes
SHA-256: 34693b4dff9c5e3527577e0d97575cfa96fb48eb3537f2a11bd456efaf5fe8f5
font_01_sfnt_off000104b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCC 10880 bytes
SHA-256: 277234c6611e59aab9d2002378e39595a3f85ece15fe35d9ac2c5f28ba686deb

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