Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cd08e952d90ecc…

MALICIOUS

PDF

73.9 KB Created: 2021-09-11 04:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c2210c088f673c14ff9273d9f1efd4f SHA-1: adbe6e2102bf085f5882036a376c7edce7be99cb SHA-256: a7cd08e952d90ecc691c88bf70d2f9ecb361b8d60bb124fd2a9819a9cdce31ca
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to external URLs. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it is designed to trick users into visiting malicious sites or initiating fraudulent calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://archism.ru/uplcv?utm_term=how+do+i+copy+my+contacts+from+one+phone+to+another PDF link annotation
    • http://koreaseals.com/ckfinder/userfiles/files/93196030260.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/duvemonekewik.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/3abbc0c86665de5db1918e16298c1978/feruxedo.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/fafabikotifidofolisepik.pdfIn PDF document text
    • http://chromavials.com/d/files/27973961250.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/pekuga.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/wasadiwav.pdfIn PDF document text
    • https://profesa.net/userFilesfile/xiviniwomomubovewas.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/4455526551.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/mejefe.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/61497221582.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/kadoxoril.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/mapulika.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/vixob.pdfIn PDF document text
    • http://195exim.com/datas/files/21996515743.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/28536365223.pdfIn PDF document text
    • http://cachnhietwin.com/luutru/files/53973211278.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16131273b418f8---fogafewenemeloxutosejojex.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/79423908220.pdfIn PDF document text
    • http://kavernoklub.com/campannas/file/pokorabukoxusaton.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/89936969585.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/56219366792.pdfIn PDF document text
    • http://kite-surf.sk/files/87436889636.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/pixotakubesulenujetas.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/dizotiludumupiwojedizoni.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/dejewovijebojo.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_off0000bd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD68 16476 bytes
SHA-256: 5a768d68840a6d0ce69f08242eeec54f9a55e8211cb711a58278170f59759f82
font_01_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF93 11028 bytes
SHA-256: e715ae6b6aaec42e6a094eb81c71dda56bd2e280e0d8a5f5a5e677d1baa483d1