Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2fc1efedd6f7025…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 07:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4428521b63aded90f61040c2830006c7 SHA-1: 6f47db1e2054478f33a72b1e8dc8bca689e733dd SHA-256: a2fc1efedd6f7025df6b030fced4f96779e569e44b13634fe53cd29d17ce22c6
146 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a callback phishing lure. It contains numerous embedded URLs, many pointing to potentially disposable domains, suggesting an attempt to host malicious content or redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate a phishing or scam attempt designed to trick the user into performing an action, such as calling a fraudulent number.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://denizyemek.com/images/fck_upload/file/wagegul.pdf In PDF document text
    • https://euchebnici.com/img/file/61742339107.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/bonixemex.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210916054735.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/93190512816.pdfIn PDF document text
    • http://aeu.pretty-match.com/upload/files/jinilukepamizu.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/93728612368.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49384418296.pdfIn PDF document text
    • https://novitas.ro/files/mudunosiwupupovolujo.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/98794666778.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/94036328099.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/xepuvepakibaxowivuzitukuw.pdfIn PDF document text
    • http://minerva-collection.net/files/files/rojawewemefiwekabifita.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109282121374492.pdfIn PDF document text
    • https://mediaget.ru/userfiles/files/25490152210.pdfIn PDF document text
    • https://shevian.com/images/file/lugimifasudujuxesojem.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/18953332351.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/24732065628.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/napikatof.pdfIn PDF document text
    • http://geasit.it/userfiles/files/sepovojopiwobafo.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210905104406234721313.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nazaduranug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=watch+the+house+arrest+of+us+online+freePDF 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_off0000af10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF10 10528 bytes
SHA-256: ffb02e21c0f60a72b514a2325cb373a312521d9ce46e5d6d16974edb12f5ed5a
font_01_sfnt_off0000c704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC704 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000df16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF16 15688 bytes
SHA-256: 78a895e3791b3a03092da349bed1838d566dd3a266e85df2c56baefff74c0ae9