Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7c1e21c151e07d6…

MALICIOUS

PDF

67.9 KB Created: 2021-09-18 00:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2c5f864c88ca59e16dafc73221d4f06f SHA-1: 33d2d21dd5089609be5660847b6be84d6c09a682 SHA-256: f7c1e21c151e07d68c5e1515e5efb8ec12794c4e7a181661f22d5490551bae89
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file is detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an image-only interface designed to trick users into clicking a hidden element, likely redirecting them to a malicious URL. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://autoskola-scp.com/files/xumigujem.pdf In PDF document text
    • http://vesimport.ru/userfiles/file/lobog.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/90727954631.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/xejemebigabujiwiwele.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/zisegokazedezuwirefis.pdfIn PDF document text
    • http://thevalleytrader.com/files/nodumitifisupuba.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/35399431875.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/budiraxibuxowoper.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/zozevelibenuxerodom.pdfIn PDF document text
    • http://vagyonvedelemszolnok.hu/admin/fck_upload/file/67744167363.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/tikeviwiwipavekozezo.pdfIn PDF document text
    • http://tpfish.com.taipei/archive/upload/files/57000508979.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/d8db11f4fc6036723377c8a85b07527b/79929768234.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/35103392467.pdfIn PDF document text
    • https://panama4d.com/contents/files/58777017902.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0f23ebd34---wusif.pdfIn PDF document text
    • http://unseretochter.com/images/file/76143875378.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/ralawibimar.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/29673441063.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/88546904526.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45979322717.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/12956087994.pdfIn PDF document text
    • http://www.immo-uno.com/ckfinder/userfiles/files/47340223686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=minecraft+mobile+and+pc+crossplayPDF 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_off0000ae71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE71 13944 bytes
SHA-256: 719664a34768f1e9f8d1ceb48e99411686afc6f05c45b86a7470318a7ca3e149
font_01_sfnt_off0000d083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD083 11028 bytes
SHA-256: d7c45e824c833cc4df7a3f64e9cef20774aff93b30a9649c69a56c2ae9e5c563
font_02_sfnt_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.